Export Schema Usage Audit

EXPORT SCHEMA USAGE AUDIT (dev-health-ops)

Context - The api/graphql/export_schema.py tool is used to export GraphQL schema in CI for drift checks. - The --out option writes to a file for comparison; stdout is used for local inspection.

Findings - The --out export path is CI-oriented and stable; no code in this area requires removal. - SQLite adapters and their wiring were deprecated in Phase 2; no active utilities left behind that require cleanup beyond what was already removed.

Recommendations - Keep the --out behavior documented and ensure CI scripts rely on it for drift checks. - Maintain a lightweight scan for leftover dead code; if future cleanup reveals an orphaned symbol, apply patch with tests to verify.