param([Parameter(Mandatory=$true)][string]$Stage)
$ErrorActionPreference = 'Stop'
if ($Stage -notin @('before', 'after')) { throw 'Stage must be before or after' }
$taskWorkspace = 'C:\Users\User\Documents\Git\ARCADIA-Studio\.local\scenario-layout-ytr83r-20260913'
$taskOutput = Join-Path $PSScriptRoot "inputs-complete-$Stage.json"
if (Test-Path -LiteralPath $taskOutput) { throw "Refusing to replace $taskOutput" }
Push-Location -LiteralPath $taskWorkspace
try {
    $taskPaths = @('Cargo.toml', 'Cargo.lock') + @(rg --files crates docs examples build harness/fixtures harness/experiments/textual-authoring-20260911)
    if ($LASTEXITCODE -ne 0) { throw 'Input enumeration failed' }
    $taskEntries = @($taskPaths | Sort-Object -Unique | ForEach-Object {
        $taskItem = Get-Item -LiteralPath $_
        [ordered]@{ path = $_.Replace('\', '/'); bytes = $taskItem.Length; sha256 = (Get-FileHash -Algorithm SHA256 -LiteralPath $_).Hash.ToLowerInvariant() }
    })
    $taskRecord = [ordered]@{
        capturedUtc = [DateTime]::UtcNow.ToString('o')
        workspace = $taskWorkspace
        base = (git rev-parse HEAD)
        branch = (git branch --show-current)
        count = $taskEntries.Count
        files = $taskEntries
    }
    $taskRecord | ConvertTo-Json -Depth 5 | Set-Content -LiteralPath $taskOutput -Encoding utf8
    if ($Stage -eq 'after') {
        $taskBefore = Get-Content -Raw -LiteralPath (Join-Path $PSScriptRoot 'inputs-complete-before.json') | ConvertFrom-Json
        $taskDifferences = @(Compare-Object ($taskBefore.files | ConvertTo-Json -Depth 5 -Compress) ($taskEntries | ConvertTo-Json -Depth 5 -Compress))
        if ($taskDifferences.Count) { throw 'Verification inputs changed during gates' }
    }
    Write-Output "Captured $($taskEntries.Count) inputs: $Stage"
} finally { Pop-Location }