chore: release v4.0.0 - sync 550+ skills and restructure docs

skills/tdd-workflows-tdd-green/SKILL.md

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+---
+name: tdd-workflows-tdd-green
+description: Implement the minimal code needed to make failing tests pass in the TDD green phase.
+---
+
+# Green Phase: Simple function
+def product_list(request):
+    products = Product.objects.all()
+    return JsonResponse({'products': list(products.values())})
+
+# Refactor: Class-based view
+class ProductListView(View):
+    def get(self, request):
+        products = Product.objects.all()
+        return JsonResponse({'products': list(products.values())})
+
+# Refactor: Generic view
+class ProductListView(ListView):
+    model = Product
+    context_object_name = 'products'
+```
+
+### Express Patterns
+
+**Inline → Middleware → Service Layer:**
+```javascript
+// Green Phase: Inline logic
+app.post('/api/users', (req, res) => {
+  const user = { id: Date.now(), ...req.body };
+  users.push(user);
+  res.json(user);
+});
+
+// Refactor: Extract middleware
+app.post('/api/users', validateUser, (req, res) => {
+  const user = userService.create(req.body);
+  res.json(user);
+});
+
+// Refactor: Full layering
+app.post('/api/users',
+  validateUser,
+  asyncHandler(userController.create)
+);
+```
+
+## Use this skill when
+
+- Moving from red to green in a TDD cycle
+- Implementing minimal behavior to satisfy tests
+- You want to keep implementation intentionally simple
+
+## Do not use this skill when
+
+- You are refactoring for design or performance
+- Tests are already passing and you need new requirements
+- You need a full architectural redesign
+
+## Instructions
+
+1. Review failing tests and identify the smallest fix.
+2. Implement the minimal change to pass the next test.
+3. Run tests after each change to confirm progress.
+4. Record shortcuts or debt for the refactor phase.
+
+## Safety
+
+- Avoid bypassing tests to make them pass.
+- Keep changes scoped to the failing behavior only.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed patterns and examples.