feat(pr-patrol): detect shared commits in overlap warnings

[OAGr]

Summary

• PR Patrol's overlap detection now checks for shared commits between overlapping PR pairs (stacked branches)
• If all overlapping files come from shared commits, the warning is suppressed entirely with a log entry
• If some files are from shared commits but others aren't, only genuine overlaps are reported with a note about the stacked relationship
• Commit SHAs are cached across pairs to minimize API calls

Fixes false positive warnings like the one on #1822/#1811 where one branch was stacked on the other.

Test plan

• TypeScript type-check passes (tsc --noEmit)
• 2674/2675 crux tests pass (1 pre-existing failure unrelated to changes)
• Verify with pnpm crux pr-patrol --dry-run --once against live repo

🤖 Generated with Claude Code

[coderabbitai]

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a505a2f0-4031-47ef-9e99-2df3e0c5fe4e

📥 Commits

Reviewing files that changed from the base of the PR and between bc2e2ae and a1f3e98.

📒 Files selected for processing (1)

• crux/pr-patrol/index.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/frosty-jennings

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[OAGr]

⚠️ PR Overlap Warning

This PR shares 1 file(s) with PR #1824:

• crux/pr-patrol/index.ts

Coordinate to avoid merge conflicts.

Posted by PR Patrol — informational only.

[OAGr]

⚠️ PR Overlap Warning

This PR shares 1 file(s) with PR #1826:

• crux/pr-patrol/index.ts

Coordinate to avoid merge conflicts.

Posted by PR Patrol — informational only.