Add skill triggering test framework

Creates tests/skill-triggering/ to validate skills trigger correctly from
naive prompts (without explicitly naming the skill). Tests 6 skills:
- systematic-debugging
- test-driven-development
- writing-plans
- dispatching-parallel-agents
- executing-plans
- requesting-code-review

All 6 tests pass - skills trigger correctly based on their descriptions.

tests/skill-triggering/prompts/dispatching-parallel-agents.txt

@@ -0,0 +1,8 @@
+I have 4 independent test failures happening in different modules:
+
+1. tests/auth/login.test.ts - "should redirect after login" is failing
+2. tests/api/users.test.ts - "should return user list" returns 500
+3. tests/components/Button.test.tsx - snapshot mismatch
+4. tests/utils/date.test.ts - timezone handling broken
+
+These are unrelated issues in different parts of the codebase. Can you investigate all of them?

tests/skill-triggering/prompts/executing-plans.txt

@@ -0,0 +1 @@
+I have a plan document at docs/plans/2024-01-15-auth-system.md that needs to be executed. Please implement it.

tests/skill-triggering/prompts/requesting-code-review.txt

@@ -0,0 +1,3 @@
+I just finished implementing the user authentication feature. All the code is committed. Can you review the changes before I merge to main?
+
+The commits are between abc123 and def456.

tests/skill-triggering/prompts/systematic-debugging.txt

@@ -0,0 +1,11 @@
+The tests are failing with this error:
+
+```
+FAIL src/utils/parser.test.ts
+  ● Parser › should handle nested objects
+    TypeError: Cannot read property 'value' of undefined
+      at parse (src/utils/parser.ts:42:18)
+      at Object.<anonymous> (src/utils/parser.test.ts:28:20)
+```
+
+Can you figure out what's going wrong and fix it?

tests/skill-triggering/prompts/test-driven-development.txt

@@ -0,0 +1,7 @@
+I need to add a new feature to validate email addresses. It should:
+- Check that there's an @ symbol
+- Check that there's at least one character before the @
+- Check that there's a dot in the domain part
+- Return true/false
+
+Can you implement this?

tests/skill-triggering/prompts/writing-plans.txt

@@ -0,0 +1,10 @@
+Here's the spec for our new authentication system:
+
+Requirements:
+- Users can register with email/password
+- Users can log in and receive a JWT token
+- Protected routes require valid JWT
+- Tokens expire after 24 hours
+- Support password reset via email
+
+We need to implement this. There are multiple steps involved - user model, auth routes, middleware, email service integration.