Fix label actor role evidence

[MkDev11]

Summary

Fix label actor role attribution so stored maintainer review and comment evidence can resolve label actors.

Root cause: contributor_repo_roles only used PR and issue authors, while the service already stores GitHub association evidence on submitted reviews and issue/PR thread comments. Label actor views depend on contributor_repo_roles, so maintainers who reviewed or commented but did not author a PR/issue could appear with actor_association=null.

Changed behavior:

• include submitted PR reviews in contributor role evidence
• include issue/PR thread comments in contributor role evidence
• keep latest known non-null association with deterministic tie-breaking
• preserve the existing label API shape

Related Issues

Closes #13

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation
• Other (describe below)

Testing

• npm test
• npm run lint
• npm run build
• npm run format:check
• git diff --check
• Temporary Postgres seed/query verification for reviewer/commenter label actor roles

Checklist

• I have read the Contributing Guide
• Code builds without errors
• New and existing tests pass (if applicable)
• Documentation updated (if applicable)
• No unnecessary dependencies added

[anderdc]

no tests

[MkDev11]

Addressed: the PR already includes packages/das/src/db-view-contracts.spec.ts, and 4e6a412 adds prebuild: npm test so the existing Build workflow runs that regression suite before nest build. Local npm run build, npm run lint, and npm run format:check pass.

[anderdc]

This repo doesn't accept tests in contributor PRs. Drop packages/das/src/db-view-contracts.spec.ts and revert packages/das/package.json (remove the new test script and the prebuild: npm test line). The SQL view changes are fine — just strip the test additions.

[MkDev11]

This repo doesn't accept tests in contributor PRs. Drop packages/das/src/db-view-contracts.spec.ts and revert packages/das/package.json (remove the new test script and the prebuild: npm test line). The SQL view changes are fine — just strip the test additions.

done