CLAUDE.md: Update status to Phase 6 in progress, add new pitfalls
and key files discovered during verification.
PLAN.md: Mark Steps 1, 2, and 2b complete with results (50/50 CLSIDs,
13/13 DAT tests). Add DecalDat functional test as Step 2b.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Covers all 5 completed phases, project structure, Phase 6 verification
strategy (bottom-up one-DLL-at-a-time testing), and known pitfalls.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
