* Implement `/query-regression` command handling and admission workflow
- Add `query-regression-slash.py` script for processing `/query-regression` commands in PR comments, validating case arguments, and checking permissions.
- Update `checks.yml` to include tests for the new slash command functionality.
- Modify `query-regression-comment.yml` to trigger on the new `Query Regression Command` workflow.
- Create `query-regression-slash.yml` to handle the dispatched command, validate allowlist and permissions, and initiate the regression workflow.
- Enhance `query-regression.yml` to support additional inputs for PR admission and SHA verification.
- Introduce `slash-command-dispatch.yml` to parse and dispatch commands from PR comments.
- Document the new command admission process in `AGENTS.md` and `README.md`.
- Add unit tests in `test_query_regression_slash.py` to cover command parsing and admission logic.
* refactor: enhance query-regression command handling with comment validation and identity checks
* feat: implement admission identity handling for query regression workflows
* refactor: update PR admission logic in query regression workflow
* refactor: update token usage in slash command dispatch and README for clarity
* test: add cases for handling re-run failed jobs and stale runner artifacts
* refactor: improve repository metadata handling in query regression scripts
* chore: enable overwrite for artifact uploads to handle re-run failed jobs
* chore: enable overwrite for query regression admission uploads
* feat: enhance query-regression admission with HMAC signing and verification
- Introduced HMAC signing for admission markers in query-regression workflows to ensure integrity and authenticity.
- Updated `query-regression-comment.test.cjs` to include tests for signing and verifying admission markers.
- Modified `query-regression-slash.py` to handle admission marker signing and verification, including checks for dispatch sender and head SHA consistency.
- Enhanced workflows to securely manage admission markers and HMAC secrets, ensuring they are not exposed to untrusted contexts.
- Improved documentation to clarify the admission process and the role of HMAC in securing the workflow.
* test: add case to find newly posted marker among newer comments
* test: add case to verify multiline output handling in write_outputs function
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