# 132 - 2026-03-23: Coverage expansion for scene MCP area, workflow catalog, vector store, and RPC server

## Summary

Completed the next coverage wave for the remaining medium-cost, high-value modules:

- scene MCP adapter paths
- workflow catalog MCP adapter paths
- LanceDB vector store edge/fallback behavior
- addon RPC server lifecycle edge cases

This pass focused on control-flow and reliability coverage, not synthetic line-padding. The new tests exercise:

- direct wrapper delegation and helper parsing in `scene.py`
- parameter validation and background-finalize behavior in `workflow_catalog.py`
- LanceDB fallback/error paths in `lance_store.py`
- background lifecycle, socket error paths, and JSON handling in `rpc_server.py`

## Updated files

- `tests/unit/tools/scene/test_scene_mcp_tools_batch.py`
- `tests/unit/tools/workflow_catalog/test_workflow_catalog_mcp_paths.py`
- `tests/unit/router/infrastructure/vector_store/test_lance_store_edge_cases.py`
- `tests/unit/adapters/rpc/test_rpc_server_edge_cases.py`
- `_docs/_TASKS/TASK-103_Coverage_Expansion_For_Scene_Workflow_Catalog_Vector_Store_And_RPC.md`
- `_docs/_TASKS/README.md`
- `_docs/_CHANGELOG/README.md`
- `_docs/_TESTS/README.md`

## Validation

```bash
poetry run pytest tests/unit -q
poetry run pytest tests/unit -q --cov=server --cov=blender_addon --cov=scripts --cov-report=term-missing:skip-covered
PRE_COMMIT_HOME=/tmp/pre-commit-cache poetry run pre-commit run --all-files
```

Result:

- unit tests: `2436 passed`
- total coverage (`server + blender_addon + scripts`): `76%`

Selected improvements:

- `server/adapters/mcp/areas/scene.py`: `74%`
- `server/adapters/mcp/areas/workflow_catalog.py`: `76%`
- `server/router/infrastructure/vector_store/lance_store.py`: `73%`
- `blender_addon/infrastructure/rpc_server.py`: `76%`
