[DanteBurbano27]

Summary

• Normalizes internal development terminology across DevFlow documentation and contract tests:
  • Replaces internal codename references (Codex, Antigravity) with descriptive architecture names (Ingestion Layer / Data Plane, Analytics Plane / Analytics & Quality Engine).
  • Renames tests/test_codex_handoff_contract.py to tests/test_ingestion_analytics_handoff_contract.py and updates test function identifiers accordingly.
  • Updates architecture diagrams, ADRs, checklists, and documentation.
• Zero functional, logic, or behavioral changes.
• All 153 unit and integration tests pass.