# Task 12 Report — Remove unreachable pgvector runtime code

Status: completed

Summary:
- Proved the retired pgvector runtime had no remaining operational adapter call sites after migration by re-running the required grep; only the packaging assertion still mentions `migrations/vector`.
- Removed the obsolete pgvector/HTTP/direct vector runtime modules, vector SQL migrations, and their affected runtime tests.
- Kept the operational semantic path on Qdrant and migrated the remaining runtime callers to that path.
- Kept `psycopg2-binary` because DWH direct PostgreSQL and session PostgreSQL code still depend on it.

Implementation notes:
- Extracted shared collection/kind validation into `harness/tht/adapters/vector/_shared.py` so `QdrantVectorStore` no longer depends on the deleted pgvector module.
- Simplified `build_vector_store()` to return only `QdrantVectorStore`.
- Migrated vector/evidence/memory CLI paths away from legacy pgvector loaders and REST vector clients.
- Updated packaging coverage so the built wheel asserts session SQL migrations are present and vector SQL migrations are absent.

Verification:
- `cd harness && .venv/bin/pytest tests/test_qdrant_vector_store.py tests/test_vector_port_contract.py tests/test_semantic_kind_isolation.py tests/test_vector_migration_packaging.py -q`
- `cd harness && .venv/bin/pytest tests/test_adapter_factory.py tests/test_solved_search_cli.py -q`
- `cd harness && .venv/bin/python -c "import tht.cli, tht.adapters.factory, tht.adapters.vector, tht.vectorstore.reader"`
- `cd harness && uv build`
- `harness/.venv/bin/ruff check harness/tests/test_adapter_factory.py harness/tests/test_solved_search_cli.py harness/tests/test_vector_migration_packaging.py harness/tests/test_vector_port_contract.py harness/tht/adapters/factory.py harness/tht/adapters/vector/__init__.py harness/tht/adapters/vector/_shared.py harness/tht/adapters/vector/qdrant.py harness/tht/cli/evidence_cmd.py harness/tht/cli/memory_cmd.py harness/tht/cli/search_cmd.py harness/tht/cli/vector_cmd.py harness/tht/solved.py harness/tht/vectorstore/reader.py`
- `git diff --check`

Notes / concerns:
- Repository-wide `harness/.venv/bin/ruff check .` still reports many pre-existing findings outside this task’s touched files; it is not clean on this branch baseline.
- Some legacy config compatibility parsing still exists outside the deleted runtime path. This task removed the unreachable runtime/migration code without broad config-schema refactoring.