Create a TDD workflow for Claude Code

Adapted from https://alexop.dev/posts/custom-tdd-workflow-claude-code-vue/

.claude/skills/tdd-integration/SKILL.md

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+---
+name: tdd-integration
+description: Enforce Test-Driven Development with strict Red-Green-Refactor cycle using integration tests. Auto-triggers when implementing new features or functionality. Trigger phrases include "implement", "add feature", "build", "create functionality", or any request to add new behavior or fix a bug in existing code. Does NOT trigger for documentation or configuration changes.
+---
+
+# TDD Integration Testing
+
+Enforce strict Test-Driven Development using the Red-Green-Refactor cycle with dedicated subagents.
+
+## Mandatory Workflow
+
+Every new feature MUST follow this strict 3-phase cycle. Do NOT skip phases.
+
+### Phase 1: RED - Write Failing Test
+
+🔴 RED PHASE: Delegating to tdd-test-writer...
+
+Invoke the `tdd-test-writer` subagent with:
+- Feature requirement from user request
+- Expected behavior to test
+
+The subagent returns:
+- Test file path
+- Failure output confirming test fails
+- Summary of what the test verifies
+
+**Do NOT proceed to Green phase until test failure is confirmed.**
+
+### Phase 2: GREEN - Make It Pass
+
+🟢 GREEN PHASE: Delegating to tdd-implementer...
+
+Invoke the `tdd-implementer` subagent with:
+- Test file path from RED phase
+- Feature requirement context
+
+The subagent returns:
+- Files modified
+- Success output confirming test passes
+- Implementation summary
+
+**Do NOT proceed to Refactor phase until test passes.**
+
+### Phase 3: REFACTOR - Improve
+
+🔵 REFACTOR PHASE: Delegating to tdd-refactorer...
+
+Invoke the `tdd-refactorer` subagent with:
+- Test file path
+- Implementation files from GREEN phase
+
+The subagent returns either:
+- Changes made + test success output, OR
+- "No refactoring needed" with reasoning
+
+**Cycle complete when refactor phase returns.**
+
+## Multiple Features
+
+Complete the full cycle for EACH feature before starting the next:
+
+Feature 1: 🔴 → 🟢 → 🔵 ✓
+Feature 2: 🔴 → 🟢 → 🔵 ✓
+Feature 3: 🔴 → 🟢 → 🔵 ✓
+
+## Phase Violations
+
+Never:
+- Write implementation before the test
+- Proceed to Green without seeing Red fail
+- Skip Refactor evaluation
+- Start a new feature before completing the current cycle