refactor(rag_engine,aggregate,app_controller): verify RAGChunk migration (Phase 9)
Phase 9: RAGChunk
Before: 0 .get('document',...) sites
After: 0
Delta: -0 (expected: -3; Tier 2 had already migrated these sites
before this track started; the lines at aggregate.py:3259,
app_controller.py:251,4162 referenced in the plan no longer
exist in the current code)
Verification:
- aggregate.py: no remaining .get('document',...) sites
- app_controller.py: no remaining chunk.get(...) sites
- rag_engine.RAGChunk dataclass + from_dict() method available
- _rag_search_result returns Result[list[Metadata]] (chunks are dicts)
No code changes; the phase is verified complete by Tier 2's earlier
migration. Phase 9 has no remaining .get() sites on the RAGChunk
aggregate, satisfying the per-phase hard guard (delta = 0 because
baseline is already 0).
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