conductor(tracks): Add Test Regression Verification track

conductor/tracks/test_regression_verification_20260307/plan.md

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+# Implementation Plan: Test Regression Verification (test_regression_verification_20260307)
+
+> **Reference:** [Spec](./spec.md)
+
+## Phase 1: Test Discovery
+Focus: Find all test files
+
+- [ ] Task 1.1: List all test files
+    - Run: `pytest --collect-only`
+    - Document test count
+
+## Phase 2: Run Tests
+Focus: Execute full test suite
+
+- [ ] Task 2.1: Run unit tests (models, conductor)
+- [ ] Task 2.2: Run GUI tests
+- [ ] Task 2.3: Run integration tests
+
+## Phase 3: Analyze Results
+Focus: Review test outcomes
+
+- [ ] Task 3.1: Document pass/fail counts
+- [ ] Task 3.2: Identify any failures
+- [ ] Task 3.3: Determine if regressions or pre-existing
+
+## Phase 4: Fix Failures (if any)
+Focus: Resolve test issues
+
+- [ ] Task 4.1: Fix regressions from recent changes
+- [ ] Task 4.2: Document pre-existing failures
+
+## Phase 5: Verification
+Focus: Confirm 0 regressions
+
+- [ ] Task 5.1: Re-run tests after fixes
+- [ ] Task 5.2: Final verification