feat(prompt-budget): track context KPIs

scripts/commands/prompt-budget.ps1

@@ -2,34 +2,11 @@
 param([switch]$Summary)
 $ErrorActionPreference = 'Stop'
 $root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
-$generated = Join-Path $root 'generated'
-if (-not (Test-Path (Join-Path $generated 'claude-bash/CLAUDE.md'))) { throw 'Generated output is missing; run build first.' }
-function Measure-Tree([string]$path) {
-    if (-not (Test-Path $path)) { return 0 }
-    return [int64]((Get-ChildItem $path -File -Recurse | ForEach-Object { $_.Length } | Measure-Object -Sum).Sum)
-}
-function Tokens([int64]$bytes) { return [int][Math]::Ceiling($bytes / 4.0) }
-$claude = (Get-Item (Join-Path $generated 'claude-bash/CLAUDE.md')).Length
-$codex = (Get-Item (Join-Path $generated 'codex-bash/AGENTS.md')).Length
-$skills = Measure-Tree (Join-Path $generated 'claude-bash/skills')
-$lazyItem = Get-ChildItem (Join-Path $root 'shared/rules') -File -Recurse | Sort-Object Length -Descending | Select-Object -First 1
-$lazy = if ($lazyItem) { [int64]$lazyItem.Length } else { 0 }
-$baseline = Join-Path $root 'adapters/prompt-budget-baseline.json'
-$old = if (Test-Path $baseline) { Get-Content $baseline -Raw | ConvertFrom-Json } else { $null }
-$rows = @([pscustomobject]@{Name='Claude permanent context';Bytes=$claude;Tokens=(Tokens $claude)},[pscustomobject]@{Name='Codex permanent context';Bytes=$codex;Tokens=(Tokens $codex)},[pscustomobject]@{Name='Claude skill files (lazy)';Bytes=$skills;Tokens=(Tokens $skills)},[pscustomobject]@{Name='Largest lazy rule';Bytes=$lazy;Tokens=(Tokens $lazy)})
-$fail = $false
-$baselineValues = @{}
-if ($old) {
-    foreach ($row in $rows | Select-Object -First 2) {
-        $previous = [double]$old.($row.Name)
-        $absolute = [double]$old.(($row.Name + ' absolute limit'))
-        $baselineValues[$row.Name] = @($previous, $absolute)
-        if ($previous -gt 0 -and $row.Bytes -gt $previous * 1.15) { Write-Warning "Prompt budget soft target exceeded: $($row.Name) $($row.Bytes) bytes (target $previous, 15% tolerance)." }
-        if ($absolute -gt 0 -and $row.Bytes -gt $absolute) { $fail = $true; Write-Error "Prompt budget hard limit failed: $($row.Name) $($row.Bytes) bytes (hard limit $absolute)." }
-    }
-}
-if ($Summary) { Write-Output 'Prompt Budget'; foreach ($row in $rows | Select-Object -First 2) { $limits = $baselineValues[$row.Name]; $base = if($limits){$limits[0]}else{'-'}; $absolute = if($limits){$limits[1]}else{'-'}; Write-Output ('{0,-28} {1,8} bytes  soft target {2}  hard limit {3}' -f $row.Name,$row.Bytes,$base,$absolute) }; $rows | Select-Object -Skip 2 | ForEach-Object { Write-Output ('{0,-28} {1,8} bytes  {2,6} tokens' -f $_.Name,$_.Bytes,$_.Tokens) } } else { $rows | ForEach-Object { Write-Output ('{0}: {1} bytes / {2} tokens' -f $_.Name,$_.Bytes,$_.Tokens) } }
+$budgetScript = Join-Path $root 'scripts/lib/prompt-budget.py'
+$budgetArgs = @()
+if ($Summary) { $budgetArgs += '--summary' }
+& python $budgetScript @budgetArgs
+$budgetExit = $LASTEXITCODE
 & python (Join-Path $root 'scripts/lib/prompt-inventory.py') --home ([Environment]::GetFolderPath('UserProfile'))
 if ($LASTEXITCODE -ne 0) { throw 'Prompt inventory failed.' }
-if ($fail) { exit 1 }
-exit 0
+exit $budgetExit