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## Thinking Path > - Paperclip uses pull request checks to protect changes. > - The trusted CI workflow selects GitHub or AWS runners. > - Stacked pull requests can advance their base branch while a gate waits. > - The gate already proves that the live base descends from the event base. > - An earlier exact base check rejects that safe state before the ancestry check runs. > - This pull request removes the conflicting check and verifies live API consistency. > - The benefit is automatic AWS routing for trusted stacked pull requests without weaker identity checks. ## Linked Issues or Issue Description Refs #12339 Refs #12457 ## What Changed - Allow the live pull request base SHA to advance from the signed event base snapshot. - Require the pull request API base SHA to match the live Git ref during validation. - Keep the numeric author, sender, and triggering actor checks. - Keep descendant ancestry and synthetic merge validation. ## Verification - actionlint .github/workflows/pr-trusted.yml .github/workflows/pr.yml - github-runners/tests/test-workflow.sh .github/workflows/pr-trusted.yml .github/workflows/pr.yml - The routing suite covers a live stacked base advance and a base change during validation. ## Risks - A trusted stacked run can use a newer descendant base than its signed event snapshot. - Replaced ancestry still fails closed. - A live base change during gate validation still fails closed. ## Model Used - OpenAI Codex, GPT-5.6, with reasoning and terminal tool use. ## 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 linked existing issues or described the issue in this pull request - [x] I have not referenced internal or instance-local Paperclip issues or links - [x] My branch name describes the change and contains no internal ticket ID - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation in the operations repository - [x] I have considered and documented risks above - [ ] All Paperclip CI gates are green - [ ] Greptile is 5/5 with no open findings - [x] I will address all Greptile and reviewer comments before requesting merge