fix(pgvector): resolve F401 unused import for psycopg

[devhub02]

Summary

Fixes F401 lint error in pgvector.py where psycopg was imported but unused.

Changes

• Replace direct import psycopg with importlib.util.find_spec("psycopg") check (ruff's recommended approach for F401)
• Add ValueError handling for mocked modules in tests (where psycopg is patched into sys.modules)

Testing

• ruff check openagent_eval/providers/retrievers/pgvector.py - All checks pass
• pytest tests/unit/test_providers/test_pgvector_retriever.py -v - All 4 tests pass

Related

Fixes #306

[graphify-labs]

Graphify reviewed this change.

Looks safe to merge — no coupling regressions and no blocking issues, checked against the code graph (not a self-assessment).

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Graphify review — findings

Replaces the import-based psycopg availability check in PGVectorRetriever.__init__ with importlib.util.find_spec, so the missing-dependency ImportError fires without actually importing the module. Swallows the ValueError find_spec raises for modules mocked into sys.modules, letting tests patch psycopg without tripping the check.

No blocking issues surfaced. 6 lower-confidence candidates did not survive cross-model review.

Analysis details — impact, health, verification

Impact & health

Graphify review

Impact — 17 functions depend on the 12 functions this change touches.

Health — grade A; no new coupling hotspots.

Verification — 17 functions in the blast radius were not formally verified this run (proofs are advisory here).

Gate & verification

graphify gate

PASS — objectively clean (no health regressions, tests not run — proofs not run this pass (advisory)). Grounded, not self-assessed.

Advisory (not blocking):

• verification_scope: 17 function(s) in the blast radius were not formally verified this run

[github-actions]

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