* fix(#416): return null when active milestone has no archive (no fall-through to prior milestone's archive)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* fix(#416): handle bold-formatted Milestone: field in archive dir resolver
The STATE.md regex in getActiveMilestoneArchiveDir failed to extract the
version from **Milestone:** vX.Y format (bold wraps the label+colon).
The old pattern captured '**' instead of the version, causing the
milestone→archive lookup to produce a false candidate path, then return
null (post-fix behavior) instead of falling through to the version-sort
fallback — breaking the #3164 consistency scanner tests.
Fix: extend the regex to skip optional trailing '**' after the colon so
both 'milestone: vX.Y' and '**Milestone:** vX.Y' parse correctly.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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