refactor(inline-checklist): extract ID helpers to shared module

[aaight]

Summary

Extracts duplicated inline-checklist ID helpers from the JIRA and Linear adapters into the shared src/pm/_shared/inline-checklist.ts module.

• INLINE_CHECKLIST_ID_PREFIX constant is now exported from the shared module
• buildChecklistId() function is now exported from the shared module
• parseChecklistId() function is now exported from the shared module
• Both src/pm/jira/adapter.ts and src/pm/linear/adapter.ts now import these from ../_shared/inline-checklist.js instead of defining them locally

This is a pure extraction refactor — zero behavioral change. The ~15 duplicate lines in each adapter are replaced with imports.

Card: https://trello.com/c/69e64e601daeb2a0e50ae3c8

Test plan

• npm run typecheck passes cleanly
• npm run lint passes cleanly (no unused imports)
• All 621 PM unit tests pass (tests/unit/pm/)
• PM conformance harness passes (tests/unit/integrations/pm-conformance.test.ts) — 72 tests, 23 skipped (pre-existing)
• Note: tests/unit/worker-entry.test.ts has a pre-existing failure on origin/dev unrelated to this refactor

🕵️ claude-code · claude-sonnet-4-6 · run details

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pm/_shared/inline-checklist.ts	92.85%	0 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[nhopeatall]

Summary

LGTM! Clean extraction of duplicated inline checklist ID logic into the shared module, with added JSDoc documentation.

Verified that:

• The extracted implementation correctly replaces the removed duplicates in both JIRA and Linear adapters.
• All unused imports were cleaned up.
• Types match and CI checks pass smoothly. Good refactoring.

🕵️ opencode · google/gemini-3.1-pro-preview · run details