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## Thinking Path > - Paperclip uses trusted GitHub Actions workflows to verify every pull request > - Native stacked pull requests use another pull request branch as their base > - A parent layer can change a package manifest without committing `pnpm-lock.yaml` > - A child layer can inherit that manifest change without changing a manifest itself > - The current policy skips lockfile regeneration for that child and downstream frozen installs fail > - This pull request validates the complete merge tree and shares a regenerated lockfile only when needed > - The benefit is reliable stacked pull request verification without weakening the trusted workflow boundary ## Linked Issues or Issue Description **What happened?** A stacked child pull request inherited a package manifest change from its parent. The child did not change a manifest itself. The policy job skipped lockfile regeneration. Downstream jobs tried to restore an artifact that did not exist and then failed during frozen dependency installation. **Expected behavior** The policy job must validate the complete pull request merge tree. It must upload a regenerated lockfile when the checked-in lockfile is stale, including on a stacked child layer. **Steps to reproduce** 1. Create a parent pull request that changes `package.json` without committing `pnpm-lock.yaml`. 2. Create a child pull request on that branch without another manifest change. 3. Run the trusted pull request workflow for the child. 4. Observe that frozen dependency installation fails because no `pr-lockfile` artifact exists. **Paperclip version or commit** `f173ee09fa5c2ced7806bba47b54c3df853ab4df` **Deployment mode** GitHub Actions trusted pull request workflow. **Agent adapter(s) involved** Not adapter-specific. This is a core CI workflow bug. ## What Changed - Regenerate the lockfile from every checked-out merge tree. - Compare the generated lockfile with the checked-in copy before upload. - Download the artifact only when the policy job reports that it uploaded one. - Fail closed when a reported artifact is missing. - Add a workflow contract test for stacked lockfile handling. - Keep the caller pinned to the last merged trusted SHA; after this implementation merges, a separate activation PR will advance the immutable pin to its merge commit. ## Verification - `actionlint .github/workflows/pr-trusted.yml` - `node --test scripts/__tests__/e2e-shard.test.mjs` ## Risks - The policy job runs one lockfile-only install for every pull request. This can add a small amount of CI time. - A missing artifact now fails immediately when the policy job reports an upload. This is intentional because it exposes workflow corruption. - No runtime or product behavior changes. - The implementation/activation split is intentional: unmerged PR-authored workflow code must never execute on trusted runners. ## Model Used OpenAI Codex with model `gpt-5`, reasoning, tool use, and code execution. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [x] All Paperclip CI gates are green - [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge