Specrew

0.37.0

scripts/internal/bootstrap/HandoverStore.ps1

                                <#

.SYNOPSIS

  Read/write the Proposal 130 session handover (schema:v1) and its index.

.DESCRIPTION

  Resource accessor (IDesign). COMPOSES Proposal 130's already-specified handover schema - it does

  NOT re-author it. F-174 is Proposal 130's first implementation; the authoritative spec is

  proposals/130-specrew-switch-to-host-handover.md (Pillar 2 body + Pillar 4a SessionEnd path).

  Do not diverge from 130:

    - frontmatter `schema: v1` + source / from_host / recorded_at / from_commit / active_feature /

      active_boundary

    - the six Pillar-2 body sections (order fixed by Get-SpecrewHandoverSectionOrder)

  The LIVE write/read path is the Stop-event ROLLING handover (`.specrew/handover/session-handover.md`,

  one always-latest file overwritten in place; see below). The timestamped SessionEnd write/read path

  (`<timestamp>-session-end-...` + an index.yml) is SUPERSEDED and removed (F-174 T041). This accessor

  only does the I/O; reads fail open. Feature 174 (FR-009, FR-010, FR-021).

#>

function Get-SpecrewHandoverSectionOrder {

    # The Proposal 130 Pillar-2 handover body, in order (verbatim section titles). F-174 iter-10 (T002,

    # FR-022) appends a 7th HOOK-OWNED section, 'Recent conversation ...', extending 130's fixed-6 with the

    # best-effort transcript tail (recorded as drift D-017 - a 174-authorized additive extension; 174 already

    # evolved this schema in iter-9 with the mechanical/interpretive ownership split). Mechanical by default

    # (it is not in the agent-owned set), so the complement logic includes it automatically.

    return @(

        'What I just did (last 3-5 turns or last boundary work)',

        "Why I'm stopping (the switch trigger)",

        'Open questions / pending clarifications',

        "Agent's working hypothesis / mental model",

        'Recommended next-immediate-step',

        "Context the receiving host needs that artifacts don't carry",

        'Recent conversation (last few exchanges, hook-captured)',

        # F-174 iter-11 (T002, DF-3): the VERBATIM rendered boundary VERDICT packet, captured from the transcript

        # by the Stop hook so a resume inherits the AUTHORED packet (not placeholders). A THIRD ownership category

        # (Get-SpecrewHandoverCapturedSections) - written when the hook captures a marker-bearing packet, PRESERVED

        # otherwise (the clobber guard, T003). It is NEITHER mechanical (it must not be refreshed/placeholdered

        # every stop) NOR agent-owned (the hook writes it, so the "non-placeholder == agent-authored" provenance

        # invariant must NOT include it).

        'Authored boundary packet (captured at stop)'

    )

}

function Get-SpecrewHandoverAgentOwnedSections {

    # F-174 iter-9: the INTERPRETIVE sections only the agent can author (via Write-SpecrewHandoverContext);

    # the hook never writes interpretive content, so a non-placeholder interpretive section IS the agent

    # provenance (no schema field needed). The hook PRESERVES these across stops within a boundary.

    return @(

        'Open questions / pending clarifications',

        "Agent's working hypothesis / mental model"

    )

}

function Get-SpecrewHandoverCapturedSections {

    # F-174 iter-11 (T002, DF-3): the THIRD ownership category - sections the HOOK populates by CAPTURING the

    # agent's actually-rendered boundary packet verbatim from the transcript (not synthesizing it, not the agent

    # calling a function). Excluded from BOTH the agent-owned set (so the "non-placeholder == agent-authored"

    # provenance invariant stays true) AND the mechanical complement (so a generic Stop with no new packet does

    # NOT refresh/placeholder it - the clobber guard preserves the last captured packet within its boundary).

    # NOTE: this returns a single-element list; PowerShell unwraps it to a bare string on return, so EVERY caller

    # must re-wrap with @(...) (or iterate with foreach, which treats a scalar as one item) before indexing [0] or

    # using -contains. All in-tree callers do; do NOT add a leading-comma "fix" - it nests the array and breaks

    # -contains (the element becomes Object[], not the title string).

    return @('Authored boundary packet (captured at stop)')

}

function Get-SpecrewHandoverMechanicalSections {

    # F-174 iter-9: the HOOK-owned sections - refreshed every material stop from the git/fs session delta

    # (they describe "now"). Derived as the complement of the agent-owned set AND the captured set (iter-11 T002)

    # within the fixed order, so a title rename in Get-SpecrewHandoverSectionOrder cannot silently desync the

    # lists, and the captured-packet section can never fall back into the refreshed-every-stop mechanical bucket.

    $reserved = @(Get-SpecrewHandoverAgentOwnedSections) + @(Get-SpecrewHandoverCapturedSections)

    return @(Get-SpecrewHandoverSectionOrder | Where-Object { $reserved -notcontains $_ })

}

function Get-SpecrewHandoverTimeScopedSections {

    # F-174 iter-10: the HOOK-owned sections that are TIME-scoped, not BOUNDARY-scoped - i.e. "recent

    # exchanges", which should carry across a boundary change (cross-session continuity is the whole point of

    # capturing them), unlike the era-scoped narrative mechanicals ("What I just did" / "Context ...") which a

    # boundary change resets. Used by the agent body-author preserve to boundary-gate the narrative mechanicals

    # while keeping the conversation tail. Currently just the conversation section (the only hook-ONLY section

    # the agent never authors). Matched against the canonical title in Get-SpecrewHandoverSectionOrder.

    return @(Get-SpecrewHandoverSectionOrder | Where-Object { $_ -like 'Recent conversation*' })

}

function Get-SpecrewHandoverPlaceholderMarker {

    # The body-section placeholder the HOOK writes when the agent has not authored a section for the

    # current boundary. Starts with "(placeholder" so the structural detector recognizes it without an

    # exact-string dependency (F-174 iter-5, failure-mode B).

    [OutputType([string])]

    param([Parameter()][AllowNull()][string] $Boundary)

    $b = if ([string]::IsNullOrWhiteSpace($Boundary)) { 'this boundary' } else { $Boundary }

    return ("(placeholder - the agent has not authored this section for {0} yet; the next session falls back to the artifact-derived orientation)" -f $b)

}

function Test-SpecrewHandoverSectionAuthored {

    # PURE: is a body section rich AGENT content vs a hook placeholder? Structural (no exact-marker

    # dependency): empty/whitespace, the iter-5 "(placeholder ..." marker, and the legacy

    # "(no relevant content)" all count as NOT authored. F-174 iter-5.

    [OutputType([bool])]

    param([Parameter()][AllowNull()][string] $Content)

    if ([string]::IsNullOrWhiteSpace($Content)) { return $false }

    $t = $Content.Trim()

    if ($t -like '(placeholder*') { return $false }

    if ($t -ieq '(no relevant content)') { return $false }

    return $true

}

function ConvertFrom-SpecrewHandoverFile {

    [CmdletBinding()]

    [OutputType([pscustomobject])]

    param([Parameter(Mandatory)][string] $Path)

    try { $lines = @(Get-Content -LiteralPath $Path -ErrorAction Stop) } catch { return $null }

    $fm = @{}

    $bodyStart = 0

    if ($lines.Count -gt 0 -and $lines[0].Trim() -eq '---') {

        for ($i = 1; $i -lt $lines.Count; $i++) {

            if ($lines[$i].Trim() -eq '---') { $bodyStart = $i + 1; break }

            $kv = $lines[$i] -split ':\s*', 2

            if ($kv.Count -eq 2) { $fm[$kv[0].Trim()] = $kv[1].Trim() }

        }

    }

    # Parse the Pillar-2 body sections (## <title> ... until the next ## or EOF). F-174 iter-5: the body

    # is read back so consumers surface the rich agent-authored content + the detector can flag a

    # placeholder. The H1 (# Session Handover ...) is skipped (single #; the regex requires exactly ##).

    # F-174 iter-11 (T002, DF-3): the captured-packet section (Get-SpecrewHandoverCapturedSections) embeds the

    # agent's VERBATIM boundary packet, which is itself six '## ' headers (## What I Just Did, ...). A flat '^##'

    # split would shred it on read-back - every inner '## ' starting a bogus section, so the captured section keeps

    # only the (near-empty) text before its first inner header -> Test-SpecrewHandoverSectionAuthored returns false

    # -> placeholder -> the clobber guard AND the resume both break. So once INSIDE a captured section, a '## ' line

    # closes it ONLY when it EXACTLY matches another KNOWN canonical handover title (the packet's own headers like

    # '## What I Just Did' do NOT match the canonical '## What I just did (last 3-5 turns ...)'); otherwise the line

    # is captured-body content. Non-captured sections parse EXACTLY as before (no behavior change off this path).

    $knownTitles = @(Get-SpecrewHandoverSectionOrder)

    $capturedTitles = @(Get-SpecrewHandoverCapturedSections)

    $sections = [ordered]@{}

    $curTitle = $null

    $inCaptured = $false

    $capturedIdx = -1

    $curLines = New-Object System.Collections.Generic.List[string]

    for ($i = $bodyStart; $i -lt $lines.Count; $i++) {

        $line = $lines[$i]

        if ($line -match '^##\s+(.*\S)\s*$') {

            $candidate = $Matches[1].Trim()

            # F-174 iter-11 (review-signoff P2-1) TERMINAL-AWARE captured-section close. Once INSIDE the captured

            # (verbatim boundary packet) section, a '## ' line closes it ONLY if it is a canonical title that sorts

            # AFTER the captured section in Get-SpecrewHandoverSectionOrder. The captured section is the LAST entry,

            # so nothing sorts after it -> the packet's OWN '## ' headers are all swallowed as captured body, even

            # ones that EXACTLY match a canonical handover title (e.g. '## What I just did (last 3-5 turns ...)').

            # The old `-notcontains` guard closed the section on ANY canonical-title collision, shredding the packet

            # to its bare marker (the resume then inherited a useless stub - the exact SC-012/SC-015 failure). This

            # self-corrects if the order ever grows a real section after the captured one.

            if ($inCaptured) {

                $candIdx = [Array]::IndexOf($knownTitles, $candidate)

                if ($candIdx -lt 0 -or $candIdx -le $capturedIdx) { $curLines.Add($line) | Out-Null; continue }

            }

            if ($null -ne $curTitle) { $sections[$curTitle] = (($curLines -join "`n").Trim()) }

            $curTitle = $candidate

            $inCaptured = ($capturedTitles -contains $candidate)

            $capturedIdx = if ($inCaptured) { [Array]::IndexOf($knownTitles, $candidate) } else { -1 }

            $curLines = New-Object System.Collections.Generic.List[string]

        }

        elseif ($null -ne $curTitle) { $curLines.Add($line) | Out-Null }

    }

    if ($null -ne $curTitle) { $sections[$curTitle] = (($curLines -join "`n").Trim()) }

    [pscustomobject]@{

        schema          = $fm['schema']; source = $fm['source']; from_host = $fm['from_host']

        recorded_at     = $fm['recorded_at']; from_commit = $fm['from_commit']

        active_feature  = $fm['active_feature']

        active_boundary = $fm['active_boundary']

        # F-174 iter-10 (T003): the AUTHORIZED-gate + workshop-phase frontmatter (distinct from active_boundary,

        # which is the WORKING position). Present only when applicable; $null otherwise.

        last_authorized_boundary = $fm['last_authorized_boundary']

        last_verdict    = $fm['last_verdict']

        workshop_done   = $fm['workshop_done']

        workshop_remaining = $fm['workshop_remaining']

        sections        = $sections

    }

}

# --- F-174 iteration 4: Stop-event ROLLING handover (supersedes the timestamped SessionEnd model) ---

function Get-SpecrewRollingHandoverPath {

    [OutputType([string])]

    param([Parameter(Mandatory)][string] $HandoverDir)

    return (Join-Path $HandoverDir 'session-handover.md')

}

function Write-SpecrewRollingHandoverContent {

    # Shared writer (F-174 iter-5 floor/body split): frontmatter FLOOR + the 6 Pillar-2 body sections

    # from $Sections (a missing/blank section -> the placeholder marker). Used by BOTH the hook

    # floor-writer (Write-SpecrewRollingHandover) and the agent body-author (Write-SpecrewHandoverContext).

    [OutputType([string])]

    param(

        [Parameter(Mandatory)][string] $Path,

        [Parameter(Mandatory)][string] $Source,

        [Parameter(Mandatory)][string] $FromHost,

        [Parameter(Mandatory)][string] $RecordedAt,

        [Parameter()][string] $FromCommit,

        [Parameter()][string] $ActiveFeature,

        [Parameter()][string] $ActiveBoundary,

        # F-174 iter-10 (T003): the AUTHORIZED-gate + workshop-phase frontmatter. HOOK-computed (the hook passes

        # them explicitly, even empty = clear); the agent body-author does NOT pass them -> they are PRESERVED

        # from the existing file (so authoring the body never strips this hook-derived state). The

        # $PSBoundParameters check distinguishes "preserve" (unbound) from "clear" (bound-but-empty).

        [Parameter()][AllowNull()][string] $LastAuthorizedBoundary,

        [Parameter()][AllowNull()][string] $LastVerdict,

        [Parameter()][AllowNull()][string] $WorkshopDone,

        [Parameter()][AllowNull()][string] $WorkshopRemaining,

        [Parameter()][System.Collections.IDictionary] $Sections = @{}

    )

    # T003 preserve: a caller that did not supply a gate/workshop field inherits the existing file's value.

    $prevFm = $null

    if (Test-Path -LiteralPath $Path) {

        $prevFm = ConvertFrom-SpecrewHandoverFile -Path $Path

        if ($null -ne $prevFm) {

            if (-not $PSBoundParameters.ContainsKey('LastAuthorizedBoundary')) { $LastAuthorizedBoundary = [string]$prevFm.last_authorized_boundary }

            if (-not $PSBoundParameters.ContainsKey('LastVerdict')) { $LastVerdict = [string]$prevFm.last_verdict }

            if (-not $PSBoundParameters.ContainsKey('WorkshopDone')) { $WorkshopDone = [string]$prevFm.workshop_done }

            if (-not $PSBoundParameters.ContainsKey('WorkshopRemaining')) { $WorkshopRemaining = [string]$prevFm.workshop_remaining }

        }

    }

    # F-174 iter-11 (T003, SC-015) CLOBBER GUARD, CENTRALIZED so BOTH callers (the hook floor-writer AND the agent

    # body-author Write-SpecrewHandoverContext) honor it. The captured-packet section (the THIRD ownership category)

    # is HOOK-captured verbatim; neither caller's own per-writer preserve touches it (it is excluded from both the

    # mechanical and agent-owned sets). So if THIS write does not supply a fresh captured packet, carry the existing

    # one forward UNCHANGED - but ONLY while it is authored AND still belongs to the CURRENT active_boundary. A

    # forward boundary change leaves it absent -> it falls to the placeholder (the prior boundary's packet is stale);

    # a later generic Stop / a placeholder refresh / the agent authoring its own sections all PRESERVE it. Mutates a

    # LOCAL copy, never the caller's dict.

    $writeSections = @{}

    foreach ($k in $Sections.Keys) { $writeSections[$k] = $Sections[$k] }

    if ($null -ne $prevFm -and $prevFm.sections -and $prevFm.sections.Count -gt 0 -and

        (([string]$prevFm.active_boundary) -eq ([string]$ActiveBoundary))) {

        foreach ($ct in (Get-SpecrewHandoverCapturedSections)) {

            $freshSupplied = $writeSections.Contains($ct) -and -not [string]::IsNullOrWhiteSpace([string]$writeSections[$ct])

            if ($freshSupplied) { continue }

            if ($prevFm.sections.Contains($ct) -and (Test-SpecrewHandoverSectionAuthored -Content ([string]$prevFm.sections[$ct]))) {

                $writeSections[$ct] = [string]$prevFm.sections[$ct]

            }

        }

    }

    # Frontmatter values are single-line key: value; collapse any newline so a value never breaks the block.

    $clean = { param($v) if ([string]::IsNullOrWhiteSpace([string]$v)) { '' } else { (([string]$v) -replace '\s+', ' ').Trim() } }

    $marker = Get-SpecrewHandoverPlaceholderMarker -Boundary $ActiveBoundary

    $out = New-Object System.Collections.Generic.List[string]

    foreach ($l in @(

            '---', 'schema: v1', "source: $Source", "from_host: $FromHost", "recorded_at: $RecordedAt",

            "from_commit: $FromCommit", "active_feature: $ActiveFeature", "active_boundary: $ActiveBoundary")) { $out.Add($l) | Out-Null }

    # T003: emit the gate + workshop lines ONLY when present, so the frontmatter stays quiet outside the

    # intake window / on legacy contexts. active_boundary above is the WORKING position; these are distinct.

    if (-not [string]::IsNullOrWhiteSpace($LastAuthorizedBoundary)) { $out.Add("last_authorized_boundary: $(& $clean $LastAuthorizedBoundary)") | Out-Null }

    if (-not [string]::IsNullOrWhiteSpace($LastVerdict)) { $out.Add("last_verdict: $(& $clean $LastVerdict)") | Out-Null }

    if (-not [string]::IsNullOrWhiteSpace($WorkshopDone)) { $out.Add("workshop_done: $(& $clean $WorkshopDone)") | Out-Null }

    if (-not [string]::IsNullOrWhiteSpace($WorkshopRemaining)) { $out.Add("workshop_remaining: $(& $clean $WorkshopRemaining)") | Out-Null }

    foreach ($l in @('---', '', '# Session Handover (rolling)', '')) { $out.Add($l) | Out-Null }

    foreach ($title in (Get-SpecrewHandoverSectionOrder)) {

        $content = if ($writeSections.Contains($title) -and -not [string]::IsNullOrWhiteSpace([string]$writeSections[$title])) {

            [string]$writeSections[$title]

        }

        else { $marker }

        $out.Add("## $title") | Out-Null; $out.Add('') | Out-Null

        $out.Add($content) | Out-Null; $out.Add('') | Out-Null

    }

    # Crash-safe replace (F-174 T050, maintainer finding): a kill landing mid-write (or between an agent's

    # delete+recreate) must never lose the handover. Write the full content to a sidecar, then promote it

    # ATOMICALLY, keeping the previous version as session-handover.md.old ([IO.File]::Replace = Win32

    # ReplaceFile - swap + backup in one atomic call). A crash mid-write leaves the intact current file; a

    # crash between write and promote leaves current + a complete .new; after promote, .old is the backup the

    # reader falls back to. Fallback to plain Set-Content only if the atomic path fails (exotic FS).

    # M3 (iter-10): per-PROCESS sidecar so two hooks firing at once (e.g. PostToolUse + Stop) don't race on a

    # shared "$Path.new". The .old backup name stays fixed (best-effort backup).

    $newPath = "$Path.$PID.new"

    try {

        Set-Content -LiteralPath $newPath -Value ($out -join "`n") -Encoding UTF8

        if (Test-Path -LiteralPath $Path) {

            [System.IO.File]::Replace($newPath, $Path, "$Path.old")

        }

        else {

            Move-Item -LiteralPath $newPath -Destination $Path -Force

        }

    }

    catch {

        $primaryErr = $_

        try {

            # Exotic-FS fallback: plain in-place write (loses the .old backup but keeps the handover current).

            Set-Content -LiteralPath $Path -Value ($out -join "`n") -Encoding UTF8

            Remove-Item -LiteralPath $newPath -Force -ErrorAction SilentlyContinue

        }

        catch {

            # M3: a TOTAL write failure (atomic Replace AND the in-place fallback both failed - read-only /

            # locked / AV'd / network-locked file) must NOT be swallowed: the handover silently stops updating

            # and the next session inherits stale content with NO signal. Surface to stderr + the

            # handover-journal (best-effort), mirroring the hollow path, so a frozen handover is diagnosable.

            [Console]::Error.WriteLine(("[specrew-handover] WARN HANDOVER_WRITE_FAILED path='{0}' primary='{1}' fallback='{2}' - the handover did NOT update this stop." -f $Path, $primaryErr.Exception.Message, $_.Exception.Message))

            try {

                $jpath = Join-Path (Split-Path -Parent (Split-Path -Parent $Path)) 'runtime/handover-journal.jsonl'

                $jdir = Split-Path -Parent $jpath

                if ($jdir -and -not (Test-Path -LiteralPath $jdir)) { New-Item -ItemType Directory -Path $jdir -Force | Out-Null }

                $rec = [pscustomobject]@{ event = 'handover-write-failed'; recorded_at = $RecordedAt; path = $Path; primary_error = $primaryErr.Exception.Message; fallback_error = $_.Exception.Message }

                ($rec | ConvertTo-Json -Compress) | Add-Content -LiteralPath $jpath -Encoding UTF8

            }

            catch { $null = $_ }

            Remove-Item -LiteralPath $newPath -Force -ErrorAction SilentlyContinue

        }

    }

    return $Path

}

function Write-SpecrewRollingHandover {

    # The HOOK floor-writer (F-174 iter-5). Refreshes the frontmatter FLOOR on each material Stop and

    # PRESERVES the agent-authored body WHEN it exists FOR THE CURRENT boundary; otherwise writes the

    # placeholder body (so a boundary-cross without authoring yields a DETECTABLE hollow body, not stale

    # content). The agent authors the rich body via Write-SpecrewHandoverContext. ONE local, gitignored,

    # always-latest file, overwritten in place. Returns the path. (supersedes the iter-4 direct-write)

    [CmdletBinding()]

    [OutputType([string])]

    param(

        [Parameter(Mandatory)][string] $HandoverDir,

        [Parameter(Mandatory)][string] $Source,          # the host stop event: stop | agentStop | Stop

        [Parameter(Mandatory)][string] $FromHost,

        [Parameter(Mandatory)][string] $RecordedAt,       # ISO-8601 (caller-supplied; deterministic)

        [Parameter()][string] $FromCommit,

        [Parameter()][string] $ActiveFeature,

        [Parameter()][string] $ActiveBoundary,

        # F-174 iter-9 (hook-primary): the hook passes the freshly-computed MECHANICAL section content (the

        # git/fs session delta) here as title -> content. Mechanical sections are HOOK-OWNED and written

        # fresh every material stop; a missing/blank mechanical title falls to the placeholder marker (the

        # truly-empty / git-unavailable case). Interpretive sections stay AGENT-owned (preserved below).

        [Parameter()][System.Collections.IDictionary] $MechanicalSections = @{},

        # F-174 iter-10 (T003): the HOOK-computed gate + workshop frontmatter, passed through (bound, even

        # empty = authoritative clear) to the shared writer. The agent body-author does not set these.

        [Parameter()][AllowNull()][string] $LastAuthorizedBoundary,

        [Parameter()][AllowNull()][string] $LastVerdict,

        [Parameter()][AllowNull()][string] $WorkshopDone,

        [Parameter()][AllowNull()][string] $WorkshopRemaining,

        # F-174 iter-11 (T002, DF-3): the VERBATIM boundary packet the hook captured from the transcript this stop.

        # Passed ONLY when the caller (Update-SpecrewRollingHandover) judged it a FRESH, CURRENT packet (its marker

        # range brackets the active boundary). When supplied it OVERWRITES the captured section; when absent the

        # shared writer's centralized clobber guard PRESERVES the existing one (within its boundary). Blank = no

        # fresh packet this stop (the common case), not an authoritative clear.

        [Parameter()][AllowNull()][string] $CapturedPacket

    )

    if (-not (Test-Path -LiteralPath $HandoverDir)) { New-Item -ItemType Directory -Path $HandoverDir -Force | Out-Null }

    $path = Get-SpecrewRollingHandoverPath -HandoverDir $HandoverDir

    # F-174 iter-9 SECTION OWNERSHIP (supersedes the iter-5 all-or-nothing preserve). Merge the body by

    # ownership so it is NEVER hollow as long as the hook captured a delta, while an agent overlay survives:

    #   - MECHANICAL (What I just did / Why I'm stopping / Recommended next / Context): written FRESH from

    #     $MechanicalSections every stop - they describe "now", so the hook owns them.

    #   - INTERPRETIVE (Open questions / Working hypothesis): AGENT-owned - preserve the EXISTING content iff

    #     it is authored (non-placeholder) AND for the CURRENT boundary; else leave it to the placeholder

    #     marker. The hook never writes interpretive content, so non-placeholder == the agent authored it

    #     (the placeholder state IS the provenance; no schema field needed). A boundary change resets them.

    $bodySections = @{}

    foreach ($mt in (Get-SpecrewHandoverMechanicalSections)) {

        if ($MechanicalSections.Contains($mt) -and -not [string]::IsNullOrWhiteSpace([string]$MechanicalSections[$mt])) {

            $bodySections[$mt] = [string]$MechanicalSections[$mt]

        }

    }

    if ((Test-Path -LiteralPath $path) -or (Test-Path -LiteralPath "$path.old")) {

        # Same .old crash-fallback as the reader: keep an agent overlay even if the live file was lost mid-write.

        $existing = if (Test-Path -LiteralPath $path) { ConvertFrom-SpecrewHandoverFile -Path $path } else { $null }

        if ($null -eq $existing) { $existing = ConvertFrom-SpecrewHandoverFile -Path "$path.old" }

        if ($null -ne $existing -and $existing.sections -and $existing.sections.Count -gt 0 -and

            (([string]$existing.active_boundary) -eq ([string]$ActiveBoundary))) {

            foreach ($it in (Get-SpecrewHandoverAgentOwnedSections)) {

                if ($existing.sections.Contains($it) -and (Test-SpecrewHandoverSectionAuthored -Content ([string]$existing.sections[$it]))) {

                    $bodySections[$it] = [string]$existing.sections[$it]

                }

            }

        }

    }

    # F-174 iter-11 (T002): inject a FRESH captured packet (the caller already judged it current). It is the third

    # ownership category, so it goes STRAIGHT into the body (not via the mechanical/agent-owned merges above);

    # when absent, the shared writer PRESERVES the existing captured section (the centralized clobber guard).

    if (-not [string]::IsNullOrWhiteSpace($CapturedPacket)) {

        foreach ($ct in (Get-SpecrewHandoverCapturedSections)) { $bodySections[$ct] = [string]$CapturedPacket }

    }

    return (Write-SpecrewRollingHandoverContent -Path $path -Source $Source -FromHost $FromHost -RecordedAt $RecordedAt `

            -FromCommit $FromCommit -ActiveFeature $ActiveFeature -ActiveBoundary $ActiveBoundary -Sections $bodySections `

            -LastAuthorizedBoundary $LastAuthorizedBoundary -LastVerdict $LastVerdict `

            -WorkshopDone $WorkshopDone -WorkshopRemaining $WorkshopRemaining)

}

function Write-SpecrewHandoverContext {

    # The AGENT body-author (F-174 iter-5, failure-mode B). The agent persists its rich re-entry/boundary

    # packet AS the handover body, then renders the packet FROM the file - so what the human sees at the

    # boundary == what the next session inherits (the render==persist integrity property). Writes the

    # floor + the agent's rich sections via the shared writer. Returns the path.

    [CmdletBinding()]

    [OutputType([string])]

    param(

        [Parameter(Mandatory)][string] $HandoverDir,

        [Parameter(Mandatory)][string] $FromHost,

        [Parameter(Mandatory)][string] $RecordedAt,       # ISO-8601 (caller-supplied; deterministic)

        [Parameter()][string] $Source = 'agent',

        [Parameter()][string] $FromCommit,

        [Parameter()][string] $ActiveFeature,

        [Parameter()][string] $ActiveBoundary,

        [Parameter(Mandatory)][System.Collections.IDictionary] $Sections   # the agent's rich 6-section content

    )

    if (-not (Test-Path -LiteralPath $HandoverDir)) { New-Item -ItemType Directory -Path $HandoverDir -Force | Out-Null }

    $path = Get-SpecrewRollingHandoverPath -HandoverDir $HandoverDir

    # F-174 iter-10 (T002 fix F2): the agent body-author does NOT capture the HOOK-owned mechanical sections -

    # notably 'Recent conversation', which only the Stop/PostToolUse hook reads from the host transcript. Left

    # alone, the shared writer would placeholder any section the agent's packet omits, so authoring the

    # boundary packet ERASES the hook-captured conversation. Mirror Write-SpecrewRollingHandover's overlay

    # preserve in reverse: carry forward any AUTHORED hook-owned mechanical section the agent omitted. Scoped

    # to the mechanical complement + gated on authored (surgical, NOT a blanket preserve-on-missing -

    # interpretive sections the agent intentionally clears stay cleared).

    $merged = @{}

    foreach ($k in $Sections.Keys) { $merged[$k] = $Sections[$k] }

    if (Test-Path -LiteralPath $path) {

        $existing = ConvertFrom-SpecrewHandoverFile -Path $path

        if ($null -ne $existing -and $existing.sections -and $existing.sections.Count -gt 0) {

            # BOUNDARY GATING (Prop-145 P2 finding): a narrative mechanical the agent omits is ERA-scoped, so it

            # must NOT be resurrected from a PRIOR boundary (that would leak stale "What I just did" / "Context"

            # across a boundary change) - same boundary-gate the sibling hook writer applies to its preserve.

            # The TIME-scoped conversation tail is the exception: it carries across boundaries (cross-session

            # continuity is the point), so it is preserved regardless of the existing file's boundary.

            $sameBoundary = (([string]$existing.active_boundary) -eq ([string]$ActiveBoundary))

            $timeScoped = Get-SpecrewHandoverTimeScopedSections

            foreach ($mt in (Get-SpecrewHandoverMechanicalSections)) {

                $agentSupplied = $merged.Contains($mt) -and -not [string]::IsNullOrWhiteSpace([string]$merged[$mt])

                if ($agentSupplied) { continue }

                if (-not ($existing.sections.Contains($mt) -and (Test-SpecrewHandoverSectionAuthored -Content ([string]$existing.sections[$mt])))) { continue }

                if (($timeScoped -contains $mt) -or $sameBoundary) {

                    $merged[$mt] = [string]$existing.sections[$mt]

                }

            }

        }

    }

    return (Write-SpecrewRollingHandoverContent -Path $path -Source $Source -FromHost $FromHost -RecordedAt $RecordedAt `

            -FromCommit $FromCommit -ActiveFeature $ActiveFeature -ActiveBoundary $ActiveBoundary -Sections $merged)

}

function Get-SpecrewRollingHandover {

    # Read the single rolling handover (session-handover.md) with a `fresh` flag. Fail open.

    [CmdletBinding()]

    [OutputType([pscustomobject])]

    param(

        [Parameter(Mandatory)][string] $HandoverDir,

        [Parameter(Mandatory)][string] $NowUtc,

        [Parameter()][int] $FreshnessHours = 24

    )

    $path = Get-SpecrewRollingHandoverPath -HandoverDir $HandoverDir

    # Crash-recovery fallback (F-174 T050): if the live file is missing or unparseable (a kill landed inside

    # an agent's delete+recreate window, or mid-write), fall back to the .old backup the atomic writer keeps.

    # One version stale beats nothing - the resume rides it plus the in-flight disk scan.

    $parsed = $null

    if (Test-Path -LiteralPath $path) { $parsed = ConvertFrom-SpecrewHandoverFile -Path $path }

    # M3 (iter-10): treat a STRUCTURALLY-INVALID parse (a truncated/corrupt file whose frontmatter has no

    # recorded_at) the SAME as missing/unparseable and fall back to .old - previously only a fully-null parse

    # triggered the fallback, so a partially-written file was accepted as a valid (but broken) handover.

    $isValid = { param($p) ($null -ne $p) -and -not [string]::IsNullOrWhiteSpace([string]$p.recorded_at) }

    if (-not (& $isValid $parsed) -and (Test-Path -LiteralPath "$path.old")) {

        $oldParsed = ConvertFrom-SpecrewHandoverFile -Path "$path.old"

        if (& $isValid $oldParsed) { $parsed = $oldParsed }

    }

    if (-not (& $isValid $parsed)) { return $null }

    $fresh = $false

    try {

        $rec = [datetime]::Parse($parsed.recorded_at).ToUniversalTime()

        $now = [datetime]::Parse($NowUtc).ToUniversalTime()

        $age = ($now - $rec).TotalHours

        $fresh = ($age -ge 0 -and $age -le $FreshnessHours)

    }

    catch { $fresh = $false }

    $parsed | Add-Member -NotePropertyName fresh -NotePropertyValue $fresh -Force

    $parsed | Add-Member -NotePropertyName path -NotePropertyValue $path -Force

    return $parsed

}

function Get-SpecrewRuntimeHostFromEnv {

    # F-174 iter-10 (T004): best-effort detection of which AI host is running THIS process, from its env

    # signals. The design-workshop refresh runs the handover provider WITHOUT --host-kind (it is invoked by

    # the agent, not the per-host hook dispatcher) and, in the pre-specify window, the anchor has no committed

    # host either - so from_host fell back to the literal 'host' sentinel (dogfood 2026-06-12). Detecting the

    # LIVE host here is correct-by-construction across the shared .agents skill root (codex vs antigravity

    # resolve by their DISTINCT session vars, which per-host skill baking could not), never stale (live env,

    # not a stored marker), and degrades to $null -> the honest 'host' when nothing matches (never a deceptive

    # value). Mirrors the per-host signal sets in hosts/<kind>/handlers.ps1 (Get-<Kind>Signals) - keep in sync;

    # the credential-only vars (CODEX_API_KEY etc., often globally set) are deliberately excluded to avoid a

    # false match in a different host's session. Returns the host kind or $null.

    [CmdletBinding()]

    [OutputType([string])]

    param()

    $signals = [ordered]@{

        codex       = @('CODEX_SESSION_ID', 'OPENAI_CODEX_CLI')

        claude      = @('CLAUDECODE', 'CLAUDE_CODE_SESSION_ID', 'CLAUDE_PROJECT_DIR')

        copilot     = @('COPILOT_AGENT_SESSION_ID', 'COPILOT_CLI', 'COPILOT_CLI_BINARY_VERSION')

        cursor      = @('CURSOR_AGENT', 'CURSOR_TRACE_ID')

        antigravity = @('ANTIGRAVITY_SESSION_ID')

    }

    foreach ($kind in $signals.Keys) {

        foreach ($var in $signals[$kind]) {

            if (-not [string]::IsNullOrWhiteSpace([Environment]::GetEnvironmentVariable($var))) { return $kind }

        }

    }

    return $null

}

function Update-SpecrewRollingHandover {

    # F-174 iter-9.1: THE single handover-save orchestration. Every trigger source - the Stop hook, the

    # PostToolUse hook, and the design-workshop skill - calls THIS; none re-implement the save. It resolves

    # the current feature/boundary/host from committed session state (+ the branch fallback for the

    # anchorless workshop window), runs the material-change gate (so it is cheap to call on EVERY tool call),

    # computes the git/fs delta, authors the MECHANICAL sections (accumulating "What I just did" newest-first

    # across the boundary window, reset on a boundary change), writes via the atomic writer, and records a

    # true-empty hollow. Composes ClassificationEngine (Test-SpecrewHandoverMaterialChange) +

    # ProjectMetadataAccessor (Resolve-SpecrewBranchFeatureRef, Get-SpecrewSessionDelta) - all co-loaded by

    # the caller. Returns a result object; callers stay fail-open. (F-174 iter-9.1.)

    [CmdletBinding()]

    [OutputType([pscustomobject])]

    param(

        [Parameter(Mandatory)][string] $ProjectRoot,

        [Parameter()][AllowNull()][string] $HostKind,                 # authoritative current host (--host-kind); else resolved

        [Parameter()][string] $Source = 'stop',                       # trigger label: stop | agentStop | PostToolUse | workshop

        [Parameter()][string] $NowUtc = ((Get-Date).ToUniversalTime().ToString('o')),

        [Parameter()][AllowNull()][string] $TranscriptPath = $null,   # F-174 iter-10 (T002): host transcript_path for conversation capture

        [Parameter()][AllowNull()][string] $LastAssistantMessage = $null

    )

    $getProp = {

        param($o, $n)

        if ($null -eq $o) { return $null }

        $p = $o.PSObject.Properties[$n]

        if ($p) { return $p.Value } else { return $null }

    }

    # Current context from the committed session state. (F-174 iter-10: T002 adds best-effort transcript

    # capture and T003 surfaces the authorized gate + workshop phase - all read from this same committed state.)

    $feature = $null; $boundary = $null; $fromHost = 'host'

    $lastAuthBoundary = $null; $lastVerdict = $null

    $ctxPath = Join-Path $ProjectRoot '.specrew/start-context.json'

    if (Test-Path -LiteralPath $ctxPath) {

        try {

            $ctx = Get-Content -LiteralPath $ctxPath -Raw | ConvertFrom-Json

            $ss = & $getProp $ctx 'session_state'

            $feature = & $getProp $ss 'feature_ref'

            $boundary = & $getProp $ss 'boundary_type'

            $h = & $getProp $ss 'host'; if ([string]::IsNullOrWhiteSpace($h)) { $h = & $getProp $ctx 'host' }

            if (-not [string]::IsNullOrWhiteSpace($h)) { $fromHost = [string]$h }

            # T003: the AUTHORIZED gate (deterministic governance state, not agent behavior) - DISTINCT from

            # session_state.boundary_type (the WORKING position above). last_authorized_boundary + the richest

            # human-legible proof from verdict_history[-1].

            $be = & $getProp $ctx 'boundary_enforcement'

            if ($null -ne $be) {

                $lab = & $getProp $be 'last_authorized_boundary'

                if (-not [string]::IsNullOrWhiteSpace($lab)) { $lastAuthBoundary = [string]$lab }

                $vhArr = @(& $getProp $be 'verdict_history')

                if ($vhArr.Count -gt 0) {

                    $lastV = $vhArr[$vhArr.Count - 1]

                    $vtext = & $getProp $lastV 'verdict_text'

                    if (-not [string]::IsNullOrWhiteSpace($vtext)) {

                        $lastVerdict = [string]$vtext

                        $vhuman = & $getProp $lastV 'authorizing_human'

                        $vcommit = & $getProp $lastV 'auth_commit_hash'

                        if (-not [string]::IsNullOrWhiteSpace($vhuman)) { $lastVerdict += " by $vhuman" }

                        if (-not [string]::IsNullOrWhiteSpace($vcommit)) { $lastVerdict += " @$vcommit" }

                    }

                }

            }

        }

        catch { $null = $_ }

    }

    # Anchorless workshop window: resolve the feature from the branch so the handover is surfaceable (T050).

    if ([string]::IsNullOrWhiteSpace([string]$feature)) { $feature = Resolve-SpecrewBranchFeatureRef -ProjectRoot $ProjectRoot }

    # T004: when neither the trigger nor the committed session-state named a host (the pre-specify workshop

    # refresh, where the anchor is not yet committed), detect the LIVE host from its env signals before

    # falling back to the literal 'host' sentinel. Only fills the gap (runs when $fromHost is still 'host'),

    # so it never overrides a known session-state host; --host-kind below still wins as the authoritative source.

    if ($fromHost -eq 'host') {

        $envHost = Get-SpecrewRuntimeHostFromEnv

        if (-not [string]::IsNullOrWhiteSpace($envHost)) { $fromHost = $envHost }

    }

    # The trigger passes the authoritative host; prefer it over the start-context value or the 'host' default.

    if (-not [string]::IsNullOrWhiteSpace($HostKind)) { $fromHost = $HostKind }

    # T003: the workshop phase, surfaced ONLY while in-flight (the pre-specify intake window); quiet otherwise.

    # Reads the SAME deterministic disk truth the bootstrap directive uses (Get-SpecrewWorkshopProgress);

    # guarded because the workshop-skill/test paths may not have co-loaded ProjectMetadataAccessor.

    $workshopDone = $null; $workshopRemaining = $null

    if (-not [string]::IsNullOrWhiteSpace([string]$feature) -and (Get-Command Get-SpecrewWorkshopProgress -ErrorAction SilentlyContinue)) {

        try {

            $wp = Get-SpecrewWorkshopProgress -ProjectRoot $ProjectRoot -FeatureRef ([string]$feature)

            if ($null -ne $wp -and $wp.in_flight) {

                $wd = @($wp.done); $wr = @($wp.remaining)

                if ($wd.Count -gt 0) { $workshopDone = ($wd -join ', ') }

                if ($wr.Count -gt 0) { $workshopRemaining = ($wr -join ', ') }

            }

        }

        catch { $null = $_ }

    }

    $handoverDir = Join-Path $ProjectRoot '.specrew/handover'

    # Material-change gate (the call-cheapness guarantee - PostToolUse fires on every tool call): refresh only

    # when the boundary moved OR there is a tracked-file change since the last write.

    $existing = Get-SpecrewRollingHandover -HandoverDir $handoverDir -NowUtc $NowUtc

    $lastBoundary = if ($null -ne $existing) { $existing.active_boundary } else { $null }

    $hasChange = $false

    # Prop-145 round-6 (HIGH, write-path half of Finding 1): this `git status` is the HOTTER instance of the

    # parent-repo-scan defect - it fires on EVERY PostToolUse, not once per session-start. Gate it on the SAME

    # repo-root check Get-SpecrewSessionDelta uses: from a nested / non-repo root under a parent git repo or

    # worktree, an ungated `git status` walks the whole parent tree (unbounded -> hangs the hook; try/catch

    # cannot bound a hung process) AND would report the PARENT'S dirty files as this project's change. Not a

    # repo root -> no tracked change to detect here (consistent with the empty Get-SpecrewSessionDelta below).

    if (Test-SpecrewIsGitRepoRoot -ProjectRoot $ProjectRoot) {

        try { $st = (& git -C $ProjectRoot status --porcelain 2>$null); $hasChange = -not [string]::IsNullOrWhiteSpace(($st -join "`n")) } catch { $null = $_ }

    }

    $mc = Test-SpecrewHandoverMaterialChange -CurrentBoundary $boundary -LastBoundary $lastBoundary -HasTrackedChange $hasChange -HandoverExists ($null -ne $existing)

    # Prop-145 round-4 (HIGH): a conversation-only turn (clean tree, same boundary) is NOT a git/boundary "material

    # change", but it IS new context that T002 promises to capture. END-OF-TURN events (Stop/agentStop/stop) fire

    # once per turn, so refresh on them regardless - capturing the latest transcript tail + recorded_at. PostToolUse

    # (per-tool-call) and the workshop refresh STAY gated (the call-cheapness guarantee). The activity-bullet logic

    # below stays delta-gated so a no-delta refresh never flushes real work out of the 6-bullet window.

    $isEndOfTurn = $Source -in @('Stop', 'agentStop', 'stop')

    if (-not $mc.material -and -not $isEndOfTurn) { return [pscustomobject]@{ wrote = $false; reason = $mc.reason; source = $Source; feature = $feature; boundary = $boundary } }

    $refreshReason = if ($mc.material) { $mc.reason } else { 'end-of-turn conversation refresh (no git/boundary delta)' }

    $head = ''

    try { $head = ([string](& git -C $ProjectRoot rev-parse --short HEAD 2>$null)).Trim() } catch { $null = $_ }

    $sinceCommit = if ($null -ne $existing) { [string]$existing.from_commit } else { $null }

    $delta = Get-SpecrewSessionDelta -ProjectRoot $ProjectRoot -SinceCommit $sinceCommit

    $featureLabel = if ([string]::IsNullOrWhiteSpace([string]$feature)) { '(no active feature)' } else { [string]$feature }

    $boundaryLabel = if ([string]::IsNullOrWhiteSpace([string]$boundary)) { '(pre-boundary / workshop)' } else { [string]$boundary }

    # One activity line for THIS refresh, accumulated newest-first across the boundary window. Lead with the

    # user's REAL changed files; the Specrew-managed scaffolding is noted by count, never listed (dogfood:

    # the ~53 managed paths were drowning the real work + filling the file cap).

    $userShownList = @($delta.user_files)

    $userShown = if ($userShownList.Count -gt 0) { ($userShownList -join ', ') } else { '(none)' }

    if (([int]$delta.user_file_count) -gt $userShownList.Count) { $userShown = "$userShown, +more" }

    $managedNote = if (([int]$delta.managed_file_count) -gt 0) { (" (+{0} Specrew-managed)" -f $delta.managed_file_count) } else { '' }

    $fileNote = " [$userShown]$managedNote"

    $commitNote = if ($delta.new_commit_count -gt 0) { ("; {0} new commit(s): {1}" -f $delta.new_commit_count, ((@($delta.new_commits)) -join ' | ')) } else { '' }

    $stamp = if ($NowUtc.Length -ge 19) { ($NowUtc.Substring(0, 19) + 'Z') } else { $NowUtc }

    $stopBullet = ("- [{0}] ({1}) {2} changed user file(s){3}; HEAD {4} ({5}){6}" -f $stamp, $Source, $delta.user_file_count, $fileNote, $delta.head_short, $delta.head_subject, $commitNote)

    $activityTitle = 'What I just did (last 3-5 turns or last boundary work)'

    $priorBullets = @()

    if ($null -ne $existing -and ([string]$existing.active_boundary -eq [string]$boundary) -and $existing.sections -and $existing.sections.Contains($activityTitle)) {

        $prev = [string]$existing.sections[$activityTitle]

        if (-not [string]::IsNullOrWhiteSpace($prev) -and $prev -notlike '(placeholder*') {

            $priorBullets = @($prev -split "`n" | Where-Object { $_ -match '^\s*-\s' })

        }

    }

    # Only PREPEND a new activity bullet when this refresh did REAL work (changed user files or new commits). A

    # no-delta end-of-turn refresh (a pure analysis/conversation turn) carries the prior bullets forward UNCHANGED,

    # so a run of conversation-only turns cannot flush the last real-work bullet out of the 6-bullet window with

    # "0 changed" noise (Prop-145 round-4). With nothing prior + no real work, the single bullet is the floor.

    $hasRealWork = (([int]$delta.user_file_count) -gt 0) -or (([int]$delta.new_commit_count) -gt 0)

    $activity = if ($hasRealWork) {

        ((@($stopBullet) + $priorBullets) | Select-Object -First 6) -join "`n"

    }

    elseif ($priorBullets.Count -gt 0) {

        (@($priorBullets) | Select-Object -First 6) -join "`n"

    }

    else {

        $stopBullet

    }

    $whyStopping = ("Hook-captured at trigger '{0}' (the agent did not author a handover this turn). Boundary: {1}. Refresh reason: {2}." -f $Source, $boundaryLabel, $refreshReason)

    $recNext = if (([int]$delta.user_file_count) -gt 0) {

        ("Resume feature {0} at boundary {1}. {2} of YOUR file(s) are uncommitted [{3}]{4} - review/commit them before advancing." -f $featureLabel, $boundaryLabel, $delta.user_file_count, $userShown, $managedNote)

    }

    elseif ($delta.has_uncommitted) {

        ("Resume feature {0} at boundary {1}. Only Specrew-managed scaffolding is uncommitted ({2} file(s)) - that is the init baseline; commit it at a boundary." -f $featureLabel, $boundaryLabel, $delta.managed_file_count)

    }

    else {

        ("Resume feature {0} at boundary {1}. Working tree is clean; continue the next lifecycle step." -f $featureLabel, $boundaryLabel)

    }

    $uncommittedNote = if (([int]$delta.user_file_count) -gt 0) {

        $mn = if (([int]$delta.managed_file_count) -gt 0) { (" ({0} Specrew-managed files also uncommitted.)" -f $delta.managed_file_count) } else { '' }

        (" Your uncommitted work: {0}.{1}" -f $userShown, $mn)

    }

    elseif ($delta.has_uncommitted) { (" No user files changed; {0} Specrew-managed scaffolding file(s) uncommitted." -f $delta.managed_file_count) }

    else { '' }

    $context = ("branch {0}, HEAD {1} ({2}). Active feature {3}, boundary {4}.{5}" -f $delta.branch, $delta.head_short, $delta.head_subject, $featureLabel, $boundaryLabel, $uncommittedNote)

    # F-174 iter-10 (T002, FR-022): the best-effort conversation tail. Fail-open + additive - only when the

    # capture component is loaded (the handover provider co-loads it; the workshop-skill/test paths may not)

    # and it yields content. Bounded inside Get-SpecrewConversationTail; never grows with the session.

    $conversation = $null

    if (Get-Command Get-SpecrewConversationTail -ErrorAction SilentlyContinue) {

        try { $conversation = Get-SpecrewConversationTail -HostKind $fromHost -TranscriptPath $TranscriptPath -LastAssistantMessage $LastAssistantMessage } catch { $conversation = $null }

    }

    # F-174 iter-11 (T002, FR-022 / DF-3): capture the VERBATIM rendered boundary packet + compute the forward-only

    # working boundary. The agent renders/authors the packet; PERSISTING it is mechanical here so a resume inherits

    # the AUTHORED packet, not placeholders (DF-3). Guarded on the same helpers the verdict capture needs (the Stop

    # handover provider co-loads shared-governance; the workshop-skill / test paths do not and correctly skip both

    # the packet capture AND the marker-based active-boundary advance, falling back to the session-state boundary).

    # active_boundary = the forward-MOST of {the session-state working position, the prior file value, the marker's

    # FROM} - the marker is a forward-only floor (the maintainer's "set active_boundary from the captured marker"),

    # and it NEVER regresses an already-forward boundary. The packet is WRITTEN only when the new active boundary is

    # NOT already PAST the marker's TO (the freshness/stale guard): a packet from a boundary we have moved beyond is

    # dropped to the placeholder, while a forward boundary change naturally REPLACES the prior packet. Fail-open.

    $activeBoundary = $boundary

    $capturedPacketBody = $null

    if (-not [string]::IsNullOrWhiteSpace($TranscriptPath) -and

        (Get-Command Get-SpecrewCapturedBoundaryPacket -ErrorAction SilentlyContinue) -and

        (Get-Command Get-SpecrewBoundaryOrder -ErrorAction SilentlyContinue) -and

        (Get-Command Normalize-SpecrewCanonicalBoundaryType -ErrorAction SilentlyContinue)) {

        try {

            $pkt = Get-SpecrewCapturedBoundaryPacket -TranscriptPath $TranscriptPath

            if ($pkt.Found) {

                $bOrder = @(Get-SpecrewBoundaryOrder)

                $idxOf = { param($b) if ([string]::IsNullOrWhiteSpace([string]$b)) { -1 } else { [Array]::IndexOf($bOrder, (Normalize-SpecrewCanonicalBoundaryType -Boundary $b)) } }

                $boundaryIdx = & $idxOf $boundary

                $priorIdx = & $idxOf $lastBoundary

                $fromIdx = & $idxOf $pkt.FromBoundary

                $toIdx = & $idxOf $pkt.ToBoundary

                # forward-most; a -1 (unrecognized boundary) never bumps the cursor (mirrors the T004 -ge 0 guards).

                $newActiveIdx = ([int[]]@($boundaryIdx, $priorIdx, $fromIdx) | Measure-Object -Maximum).Maximum

                if ($newActiveIdx -ge 0 -and $newActiveIdx -lt $bOrder.Count) { $activeBoundary = $bOrder[$newActiveIdx] }

                # FRESHNESS: write iff the active boundary is within the marker's [FROM..TO] range, i.e. not already

                # past TO. A -1 on either side fails OPEN (cannot rank -> do not reject), mirroring T004.

                $isFresh = ($toIdx -lt 0) -or ($newActiveIdx -lt 0) -or ($newActiveIdx -le $toIdx)

                if ($isFresh) { $capturedPacketBody = [string]$pkt.PacketBody }

            }

        }

        catch { [Console]::Error.WriteLine("[specrew-handover] WARN PACKET_CAPTURE_FAILED $($_.Exception.Message)") }

    }

    $mechanical = @{

        $activityTitle                                                = $activity

        "Why I'm stopping (the switch trigger)"                       = $whyStopping

        'Recommended next-immediate-step'                             = $recNext

        "Context the receiving host needs that artifacts don't carry" = $context

    }

    if (-not [string]::IsNullOrWhiteSpace($conversation)) {

        $mechanical['Recent conversation (last few exchanges, hook-captured)'] = $conversation

    }

    Write-SpecrewRollingHandover -HandoverDir $handoverDir -Source $Source -FromHost $fromHost `

        -RecordedAt $NowUtc -FromCommit $head -ActiveFeature $feature -ActiveBoundary $activeBoundary `

        -MechanicalSections $mechanical -CapturedPacket $capturedPacketBody `

        -LastAuthorizedBoundary $lastAuthBoundary -LastVerdict $lastVerdict `

        -WorkshopDone $workshopDone -WorkshopRemaining $workshopRemaining | Out-Null

    # F-174 iteration 011 (T004, FR-026 / decision f174-i011-verdict-authority-stop-hook): THE HOOK IS THE

    # VERDICT AUTHORITY. On an end-of-turn stop, read the transcript for the human's verdict on the most recently

    # rendered boundary packet (Get-SpecrewCapturedBoundaryVerdict, tied to the packet marker) and, if it is a

    # CLEAR approval that advances the gate FORWARD, record the authorization with the captured verdict +

    # evidence-source 'hook-captured-from-transcript'. This is what replaces boundary-sync's DELETED fabrication

    # (T005): the gate advances ONLY on a real, captured human verdict - never invented. Guarded: runs only when

    # BOTH the reader and the writer are loaded (the Stop-hook handover provider co-loads shared-governance; the

    # design-workshop-refresh / test paths do not and correctly skip the authorization). Identity is left

    # UNATTRIBUTED unless a host surface proves it (none reliably does yet) - honest over invented. CONTIGUOUS

    # one-boundary-at-a-time (the gate-contiguity guard below; the reader's contradiction/ambiguity guards already

    # gate Found); fully fail-open - a capture failure degrades to "un-authorized", surfaced by the resume (T006),

    # and NEVER blocks the stop.

    if ($isEndOfTurn -and -not [string]::IsNullOrWhiteSpace($TranscriptPath) -and

        (Get-Command Get-SpecrewCapturedBoundaryVerdict -ErrorAction SilentlyContinue) -and

        (Get-Command Add-SpecrewBoundaryAuthorization -ErrorAction SilentlyContinue) -and

        (Get-Command Get-SpecrewBoundaryOrder -ErrorAction SilentlyContinue)) {

        try {

            $captured = Get-SpecrewCapturedBoundaryVerdict -TranscriptPath $TranscriptPath

            if ($captured.Found) {

                $bOrder = @(Get-SpecrewBoundaryOrder)

                $fromIdx = [Array]::IndexOf($bOrder, (Normalize-SpecrewCanonicalBoundaryType -Boundary $captured.FromBoundary))

                $toIdx = [Array]::IndexOf($bOrder, (Normalize-SpecrewCanonicalBoundaryType -Boundary $captured.ToBoundary))

                $authIdx = if ([string]::IsNullOrWhiteSpace([string]$lastAuthBoundary)) { -1 } else { [Array]::IndexOf($bOrder, (Normalize-SpecrewCanonicalBoundaryType -Boundary $lastAuthBoundary)) }

                # GATE CONTIGUITY (one-boundary-at-a-time). Forward-only ($toIdx > $authIdx) is NECESSARY but NOT

                # SUFFICIENT: with lastAuth=plan and a marker 'tasks -> before-implement', a forward-only check would

                # apply the human's REAL before-implement approval while the 'plan -> tasks' gate was NEVER

                # authorized - skipping a gate. So require the capture to advance EXACTLY one gate from the cursor:

                #   (1) the marker's FROM must EQUAL last_authorized_boundary ($fromIdx == $authIdx), and

                #   (2) the marker's TO must be the IMMEDIATE successor of FROM ($toIdx == $fromIdx + 1).

                # Anything else (from != cursor, or a multi-gate jump like tasks -> review-signoff) is REJECTED. We

                # do NOT rewrite FROM to the cursor to force contiguity - that would mask the skip; we reject the

                # capture as unsafe, leave the gate where it is (the resume surfaces awaiting-verdict so the human

                # re-confirms the missing boundary), and journal the mismatch. This ALSO gives idempotence: once the

                # gate has advanced, the same marker's FROM no longer equals the (now-advanced) cursor, so a re-fired

                # Stop is a no-op.

                if ($fromIdx -ge 0 -and $fromIdx -eq $authIdx -and $toIdx -eq ($fromIdx + 1)) {

                    Add-SpecrewBoundaryAuthorization -ProjectRoot $ProjectRoot `

                        -CurrentBoundary $captured.FromBoundary -AuthorizedBoundary $captured.ToBoundary `

                        -AuthorizingHuman 'unattributed' -VerdictText $captured.VerdictText `

                        -EvidenceSource 'hook-captured-from-transcript' | Out-Null

                }

                elseif ($toIdx -gt $authIdx) {

                    # A CLEAR approval whose marker is forward but NON-CONTIGUOUS with the cursor: refuse to apply it

                    # (applying it would skip an earlier unauthorized gate). Record the mismatch for forensics; the

                    # gate stays put and the resume (T006) surfaces awaiting-verdict for the contiguous boundary.

                    [Console]::Error.WriteLine(("[specrew-handover] WARN MARKER_CURSOR_MISMATCH captured '{0}->{1}' is not contiguous with the authorized cursor '{2}'; NOT authorizing (one-boundary-at-a-time)." -f $captured.FromBoundary, $captured.ToBoundary, $lastAuthBoundary))

                    try {

                        $mmJournal = Join-Path $ProjectRoot '.specrew/runtime/handover-journal.jsonl'

                        $mmDir = Split-Path -Parent $mmJournal

                        if ($mmDir -and -not (Test-Path -LiteralPath $mmDir)) { New-Item -ItemType Directory -Path $mmDir -Force | Out-Null }

                        (([pscustomobject]@{ event = 'marker-cursor-mismatch'; recorded_at = $NowUtc; captured_from = $captured.FromBoundary; captured_to = $captured.ToBoundary; authorized_cursor = [string]$lastAuthBoundary; source = $Source }) | ConvertTo-Json -Compress) | Add-Content -LiteralPath $mmJournal -Encoding UTF8

                    }

                    catch { $null = $_ }

                }

            }

        }

        catch { [Console]::Error.WriteLine("[specrew-handover] WARN VERDICT_CAPTURE_FAILED $($_.Exception.Message)") }

    }

    # M2 (iter-10): hollow = the git delta GENUINELY produced nothing (git unavailable / the fail-safe empty

    # shape), NOT the formatted-section count. The old check counted $mechanical.Values, which are always-

    # non-empty formatted strings, so $mechAuthored was always >=4 and $hollow was always false -> the WARN +

    # journal backstop below was dead code, and a genuinely information-poor handover surfaced as authoritative.

    $hollow = ([string]::IsNullOrWhiteSpace([string]$delta.branch) -and `

        [string]::IsNullOrWhiteSpace([string]$delta.head_short) -and `

        (-not $delta.has_uncommitted) -and `

        (([int]$delta.new_commit_count) -eq 0))

    if ($hollow) {

        [Console]::Error.WriteLine(("[specrew-handover] WARN HOLLOW_HANDOVER boundary='{0}' reason='{1}' - the hook captured no session delta (git unavailable?); the next session inherits a hollow handover." -f $boundary, $mc.reason))

        try {

            $jpath = Join-Path $ProjectRoot '.specrew/runtime/handover-journal.jsonl'

            $jdir = Split-Path -Parent $jpath

            if ($jdir -and -not (Test-Path -LiteralPath $jdir)) { New-Item -ItemType Directory -Path $jdir -Force | Out-Null }

            $rec = [pscustomobject]@{ event = 'hollow-handover-at-stop'; recorded_at = $NowUtc; boundary = $boundary; feature = $feature; from_host = $fromHost; material_reason = $mc.reason; source = $Source }

            ($rec | ConvertTo-Json -Compress) | Add-Content -LiteralPath $jpath -Encoding UTF8

        }

        catch { $null = $_ }

    }

    return [pscustomobject]@{ wrote = $true; reason = $mc.reason; source = $Source; feature = $feature; boundary = $boundary; from_host = $fromHost; hollow = $hollow }

}