Claude Opus 5.5 on Diagnose why GitHub Actions stopped running

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 "result": "I've fixed the workflow and written `DIAGNOSIS.md`. I couldn't confirm on GitHub that CI runs again, because that needs a real push and I was working offline.\n\n**Root cause:** Both the `push` and `pull_request` triggers in `repo/.github/workflows/ci.yml` only fire for `main`. When the default branch was renamed to `trunk` on 2026-10-01, GitHub didn't update that filter in the workflow file. Since then no push or PR has matched, so GitHub skips every event without any error, which is why nothing shows up in the Actions tab.\n\n**Fix:** I changed `branches: [ main ]` to `branches: [ trunk ]` for both triggers. Nothing else in the file changed. The `paths: ['src/**']` filter already matches the move from `app/` to `src/`, so it wasn't part of the problem.\n\nTwo things you should know:\n- **Some pushes still won't run CI.** Because of that `paths: ['src/**']` filter, a push to `trunk` that only changes `tests/`, the workflow file or the docs won't start a run. PRs aren't affected. This is probably why the notes say CI \"ran on every push\" when it didn't quite. To change that, add `tests/**` and `.github/workflows/**` to the filter, or remove it.\n- **The CI job won't actually test anything.** `tests/test_calc.py` only contains `import unittest`, so running the tests locally reports \"NO TESTS RAN\" and exits with an error. That will probably make the CI job fail once it starts running. It's separate from the trigger problem, but you'll likely hit it next.\n\n`DIAGNOSIS.md` is in the working directory, next to `repo/`.",
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