feat(handoff): accept synonym section headings in lint

[solomonneas]

Summary

• Accept unambiguous synonym ## headings in handoff lint via an explicit synonym map (e.g. TL;DR → Summary, Memory action → Recommended memory action).
• Fail on collisions when two headings map to the same canonical section.
• Resolve the same synonyms in draft summaries so card/document targets are not dropped after a clean lint. No --fix / no file rewrite; handoff migrate stays for freeform notes.

Fixes #476

Test plan

• brigade work verify run --target . --command "./scripts/verify" (exit 0)
• Synonym accept, collision reject, canonical still passes, draft summary resolves synonym Card target

Made with Cursor

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