name: cascade-list-drift-gate

# Structural gate: TEMPLATES list in publish-runtime.yml must match
# manifest.json's workspace_templates exactly. Closes the recurrence
# path of PR #2556 (the data fix) and is the first concrete deliverable
# of RFC #388 PR-3.
#
# Why a gate, not just discipline: PR #2536 pruned the manifest, but the
# cascade list wasn't updated for ~weeks before someone (PR #2556)
# noticed during an unrelated audit. During that window, codex never
# rebuilt on a runtime publish. A structural gate catches the drift
# the same day either file changes.
#
# Triggers narrowly to keep CI quiet: only on PRs that actually change
# one of the two files. The path-filtered split + always-emit-result
# pattern (memory: "Required check names need a job that always runs")
# is unnecessary here because the workflow IS the check name and PR
# branch protection should require it directly. Future-proof: if this
# becomes a required check, add a no-op aggregator with always() so the
# name still emits when paths don't match.

on:
  pull_request:
    branches: [staging, main]
    paths:
      - manifest.json
      - .github/workflows/publish-runtime.yml
      - scripts/check-cascade-list-vs-manifest.sh

permissions:
  contents: read

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
      - name: Check cascade list matches manifest
        run: bash scripts/check-cascade-list-vs-manifest.sh
