Multiple Sources
   ↓
Canonical Ingestion
   ↓
Source-Aware Provenance
   ↓
Dense + BM25
   ↓
RRF Hybrid Retrieval
   ↓
RRF-k Sensitivity
   ↓
Structural Eligibility
   ↓
Metadata Filtering
   ↓
Optional Reranking
   ↓
Reproducible Evaluation
   ↓
FastAPI Boundary

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