fix(github): paginate listCommits to return all PR commits

[kitsuyui]

Summary

• getCommitIds called pulls.listCommits without per_page or pagination, so only the first 30 commits (GitHub's default) were returned
• PRs with more than 30 commits silently dropped later commits from rule evaluation, making lucky-commit matching non-deterministic
• Switch to octokit.paginate with per_page: 100 so all pages are fetched regardless of PR size

Changes

• src/github.ts: replace octokit.pulls.listCommits with octokit.paginate(octokit.pulls.listCommits, { per_page: 100 })
• src/github.spec.ts: update mock and assertion to use paginate; add a test for multi-page commit lists
• dist/: rebuilt

Test plan

• All 47 tests pass (bun run test)
• biome check passes with no fixes applied
• madge --circular src/ reports no circular dependencies
• Build succeeds (bun run build)

[github-actions]

🎉 Happy commit!

• dogfooding: PR fix(github): paginate listCommits to return all PR commits #836 always celebrates.
• dogfooding: a6303b38626ff3f3dd63ab833edad567d1af6604 always celebrates.

[github-actions]

gh-counter

PR gate

	Removed	Added	+/-
TODO/FIXME	0	0	0

Repo dashboard

	main (98984a1)	#836 (e79986c)	+/-
TODO/FIXME	0	0	0

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Reported by gh-counter

[github-actions]

Code Metrics Report

	main (fd2ef70)	#836 (e79986c)	+/-
Coverage	99.1%	99.2%	+0.0%
Code to Test Ratio	1:0.5	1:0.5	-0.1
Test Execution Time	1s	1s	0s

Details

  |                     | main (fd2ef70) | #836 (e79986c) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          99.1% |          99.2% | +0.0% |
  |   Files             |              5 |              5 |     0 |
  |   Lines             |            122 |            131 |    +9 |
+ |   Covered           |            121 |            130 |    +9 |
- | Code to Test Ratio  |          1:0.5 |          1:0.5 |  -0.1 |
  |   Code              |           1598 |           1630 |   +32 |
+ |   Test              |            898 |            912 |   +14 |
  | Test Execution Time |             1s |             1s |    0s |

Code coverage of files in pull request scope (100.0% → 100.0%)

Files	Coverage	+/-	Status
src/github.ts	100.0%	0.0%	modified

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Reported by octocov

[github-actions]

gh-build-size

Target	main	#836	+/-
Total action artifacts	23,300,320 B	23,300,369 B	+49 B
Runtime bundle	1,153,633 B	1,153,652 B	+19 B
Source maps	17,130,662 B	17,130,692 B	+30 B

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Reported by gh-build-size