## Summary
- Adds a `check-changes` job to CI that detects if a PR only modifies
files in `.claude/`
- Skips the expensive `test` and `merge-reports` jobs when only Claude
config files are changed
- Always runs tests on pushes to main branch for safety

## Test plan
- Create a PR that only changes files in `.claude/` → CI should skip E2E
tests
- Create a PR that changes files outside `.claude/` → CI should run E2E
tests normally
- Push to main → CI should always run E2E tests

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Skip E2E tests in CI when a PR only changes files in .claude/, cutting
build time and saving resources. Tests always run on pushes to main;
aligns with Linear issue 1769548046265.

- **New Features**
- Added a check-changes job that outputs should_run_tests based on the
diff (PR vs push).
- Gated test and merge-reports jobs on should_run_tests; skip when only
.claude/ files changed.
  - Falls back to running tests if changed files can’t be determined.

<sup>Written for commit a75bfed9498b31634a8944d63a435688e0bac8ac.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>