Live EVIDENCE-index Postgres hybrid smoke

Product indexes / retrieve: sql/001_agent_and_evidence_indexes.sql, sql/002_evidence_hybrid_retrieve.sql, fixtures in sql/003_evidence_seed_cobol.sql (embedding left NULL in 003 — loader fills vectors).

Harness (Python, not product):

load_evidence_seed.py — same fixture IDs as 003 → evidence, deterministic hashed bag-of-tokens → vector(1536) via embed / fmt_vector from load_agent_registry.py
evidence_hybrid_smoke.py — COBOL balance hybrid query (dense + lexical + authority; min_authority=0.5; require_parent=false — junk dropped by authority floor)

Done criteria: ev_copybook_01 / ev_cobol_src_01 / ev_db2_schema_01 beat Quant; ev_junk_low_auth dropped at min_authority=0.5.

Measured log: logs/evidence_hybrid_smoke.log