Fixes phase number handling to support all formats: integers (12),
decimals (12.1), letter-suffix (12A), and hybrids (12A.1).
Changes:
- normalizePhaseName() now handles letter+decimal format
- New comparePhaseNum() helper for correct sort order
- All directory .sort() calls use comparePhaseNum instead of parseFloat
- All phase-matching regexes updated with [A-Z]? for letter support
- cmdPhaseComplete uses comparePhaseNum for next-phase detection
- Export comparePhaseNum and normalizePhaseName for unit testing
- 14 new unit tests for comparePhaseNum (8) and normalizePhaseName (6)
Sort order: 12 → 12.1 → 12.2 → 12A → 12A.1 → 12A.2 → 12B → 13
Fixes#621
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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