🧹 REPOSITORY CLEANUP: Establish canonical documentation hierarchy

✅ CANONICAL DOCUMENTATION ESTABLISHED:
- Created CANONICAL_DOCUMENTATION_MANIFEST.md - Single source of truth hierarchy
- Eliminated ALL duplicate/redundant documentation files
- Established clear authority chain: AGENTS.md → Specialized docs → Implementation

🗑️ ELIMINATED REDUNDANT FILES:
- MAGIC_NUMBERS_ELIMINATION_REPORT.md (consolidated into FINAL_REPORT)
- MAGIC_NUMBERS_TODO_SYSTEMATIC.md (work completed)
- MAGIC_NUMBER_ELIMINATION_COMPLETE.md (consolidated)
- PHASE_8_SDK_EXTENSIONS_CANONICALIZATION_REPORT.md (consolidated)
- PHYSICS_FIELDS_MAGIC_NUMBER_ELIMINATION.md (consolidated)
- PHYSICS_INTERACTIONS_MAGIC_NUMBER_ELIMINATION.md (consolidated)
- EXAMPLES_OPTIMIZATION_SUMMARY.md (outdated)
- magic_numbers_replacement_summary.py (temporary script)
- RESEARCH_QUICK_START.md (superseded by AGENTS.md)
- CANONICAL_SOURCES.md (superseded by manifest)
- GLYPH_SEQUENCES_GUIDE.md (covered in AGENTS.md + UNIFIED_GRAMMAR_RULES.md)
- MIGRATION_GUIDE.md (refers to outdated architecture)
- docs/DOCUMENTATION_HIERARCHY.md (redundant with manifest)
- docs/CROSS_REFERENCE_MATRIX.md (redundant with manifest)

📚 UPDATED CANONICAL REFERENCES:
- README.md: Clean documentation section pointing to canonical sources
- DOCUMENTATION_INDEX.md: Updated hierarchy with manifest reference
- research/README.md: Clear experimental disclaimer and canonical redirects

🎯 SINGLE SOURCE OF TRUTH ACHIEVED:
- AGENTS.md: Ultimate authority for all TNFR concepts
- CANONICAL_DOCUMENTATION_MANIFEST.md: Documentation hierarchy authority
- src/tnfr/constants/canonical.py: Mathematical constants authority
- UNIFIED_GRAMMAR_RULES.md: Grammar physics authority

Impact: Repository now has clean, non-redundant canonical documentation
hierarchy ensuring no conflicting information and clear authority chain.

Mathematical purity maintained with zero documentation duplication.

Author: TNFR AI Agent