Clean up documentation for public release

Changes:
- Rewrote PROTOCOL_FINDINGS.md to be clean protocol spec
  - Removed all DLL/assembly/class name references
  - Removed outdated "Next Steps" sections
  - Focused purely on protocol documentation
  - Added clear packet examples and command reference

- Removed outdated historical docs:
  - SUMMARY.md (investigation notes, now obsolete)
  - ANALYSIS_GUIDE.md (pre-completion guide, no longer needed)

- Created .claude.md for internal context
  - Contains all decompilation details
  - Lists specific DLL names and source locations
  - Preserves context for AI assistants
  - Added to .gitignore (not committed to repo)

Result:
- Public repo now has clean, legal documentation
- Internal context preserved for development
- Reduced legal surface area
- Docs focus on protocol, not implementation source

Remaining docs (all clean):
- PROTOCOL_FINDINGS.md - Protocol specification
- IMPLEMENTATION_GUIDE.md - Python implementation guide
- HOME_ASSISTANT_INTEGRATION.md - HA integration plan
- MISSION_ACCOMPLISHED.md - Project summary

.gitignore

@@ -31,6 +31,9 @@ Dexamarin/
 *.log
 .claude/
 
+# Internal context (not for public repo)
+*.claude.md
+
 # Scripts that were used for extraction (keep these)
 !extract_xaba_v2.py
 !extract_xaba_v2_new.py