# Review Report: Pipeline Cleanup (M1 + M3)
Date: 2026-03-11

## Result: ✅ Approved (2 low-severity unused imports fixed inline)

---

## Problems Found

### render-worker/scripts/blender_render.py:20 — Unused `import math`
**Severity**: Low
**Description**: `import math` is at the top of the entry-point but `math` is no longer referenced there — all math operations moved to submodules.
**Fix**: Remove the import. Applied inline.

### render-worker/scripts/_blender_import.py:5 — Unused `import re as _re`
**Severity**: Low
**Description**: `re` module is imported at module level but not used anywhere in `_blender_import.py`. The `_re.sub` calls live in `_blender_materials.py`.
**Fix**: Remove the import. Applied inline.

---

## Positives

- **Dead code thoroughly removed**: `VALID_STL_QUALITIES`, `stl_quality` (7 locations in admin.py), 6 frontend files, `_mark_sharp_and_seams()` (62 lines), `_render_via_service()` (33 lines), 2 dead `elif renderer == "threejs"` branches — all gone. All acceptance gates pass.
- **Submodule decomposition is clean**: `blender_render.py` went 858 → 249 lines. Each submodule has a clear single responsibility with correct `sys.path.insert(0, ...)` for Blender Python discovery.
- **GPU activation order preserved**: `activate_gpu()` still called before `open_mainfile`, and again after engine init — the critical 3-call sequence is intact in `configure_engine()`.
- **FailedMaterial sentinel preserved**: `assign_failed_material` in `_blender_materials.py` matches the original logic; unmatched parts in `apply_material_library` are now handled internally.
- **`part_names_ordered` global → parameter**: Correctly converted to an explicit parameter in `apply_material_library()`.
- **No security issues**: No hardcoded credentials, no SQL injections, no new endpoints, no new models.
- **No render pipeline regressions**: No references to removed blender-renderer or threejs-renderer services.
- **Frontend**: TypeScript errors in output are pre-existing (Admin.tsx GPUProbeResult, InlineCadViewer.tsx), not introduced by this change.

---

## Recommendation
Approved. Two unused imports fixed inline before commit.