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.cursor/skills/refactor/phases/00-baseline.md

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+# Phase 0: Context & Baseline
+
+**Role**: Software engineer preparing for refactoring
+**Goal**: Collect refactoring goals, create run directory, capture baseline metrics
+**Constraints**: Measurement only — no code changes
+
+## 0a. Collect Goals
+
+If PROBLEM_DIR files do not yet exist, help the user create them:
+
+1. `problem.md` — what the system currently does, what changes are needed, pain points
+2. `acceptance_criteria.md` — success criteria for the refactoring
+3. `security_approach.md` — security requirements (if applicable)
+
+Store in PROBLEM_DIR.
+
+## 0b. Create RUN_DIR
+
+1. Scan REFACTOR_DIR for existing `NN-*` folders
+2. Auto-increment the numeric prefix (e.g., if `01-testability-refactoring` exists, next is `02-...`)
+3. Determine the run name:
+   - If guided mode with input file: derive from input file name or context (e.g., `01-testability-refactoring`)
+   - If automatic mode: ask user for a short run name, or derive from goals (e.g., `01-coupling-refactoring`)
+4. Create `REFACTOR_DIR/NN-[run-name]/` — this is RUN_DIR for the rest of the workflow
+
+Announce RUN_DIR path to user.
+
+## 0c. Capture Baseline
+
+1. Read problem description and acceptance criteria
+2. Measure current system metrics using project-appropriate tools:
+
+| Metric Category | What to Capture |
+|----------------|-----------------|
+| **Coverage** | Overall, unit, blackbox, critical paths |
+| **Complexity** | Cyclomatic complexity (avg + top 5 functions), LOC, tech debt ratio |
+| **Code Smells** | Total, critical, major |
+| **Performance** | Response times (P50/P95/P99), CPU/memory, throughput |
+| **Dependencies** | Total count, outdated, security vulnerabilities |
+| **Build** | Build time, test execution time, deployment time |
+
+3. Create functionality inventory: all features/endpoints with status and coverage
+
+**Self-verification**:
+- [ ] RUN_DIR created with correct auto-incremented prefix
+- [ ] All metric categories measured (or noted as N/A with reason)
+- [ ] Functionality inventory is complete
+- [ ] Measurements are reproducible
+
+**Save action**: Write `RUN_DIR/baseline_metrics.md`
+
+**BLOCKING**: Present baseline summary to user. Do NOT proceed until user confirms.