Update .gitignore to include additional file types and directories for Python projects, enhancing environment management and build artifacts exclusion.

.cursor/skills/plan/templates/integration-traceability-matrix.md

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+# E2E Traceability Matrix Template
+
+Save as `PLANS_DIR/integration_tests/traceability_matrix.md`.
+
+---
+
+```markdown
+# E2E Traceability Matrix
+
+## Acceptance Criteria Coverage
+
+| AC ID | Acceptance Criterion | Test IDs | Coverage |
+|-------|---------------------|----------|----------|
+| AC-01 | [criterion text] | FT-P-01, NFT-PERF-01 | Covered |
+| AC-02 | [criterion text] | FT-P-02, FT-N-01 | Covered |
+| AC-03 | [criterion text] | — | NOT COVERED — [reason and mitigation] |
+
+## Restrictions Coverage
+
+| Restriction ID | Restriction | Test IDs | Coverage |
+|---------------|-------------|----------|----------|
+| RESTRICT-01 | [restriction text] | FT-N-02, NFT-RES-LIM-01 | Covered |
+| RESTRICT-02 | [restriction text] | — | NOT COVERED — [reason and mitigation] |
+
+## Coverage Summary
+
+| Category | Total Items | Covered | Not Covered | Coverage % |
+|----------|-----------|---------|-------------|-----------|
+| Acceptance Criteria | [N] | [N] | [N] | [%] |
+| Restrictions | [N] | [N] | [N] | [%] |
+| **Total** | [N] | [N] | [N] | [%] |
+
+## Uncovered Items Analysis
+
+| Item | Reason Not Covered | Risk | Mitigation |
+|------|-------------------|------|-----------|
+| [AC/Restriction ID] | [why it cannot be tested at E2E level] | [what could go wrong] | [how risk is addressed — e.g., covered by component tests in Step 5] |
+```
+
+---
+
+## Guidance Notes
+
+- Every acceptance criterion must appear in the matrix — either covered or explicitly marked as not covered with a reason.
+- Every restriction must appear in the matrix.
+- NOT COVERED items must have a reason and a mitigation strategy (e.g., "covered at component test level" or "requires real hardware").
+- Coverage percentage should be at least 75% for acceptance criteria at the E2E level.