fix: word-boundary routing + debug route command (#31)

- Replace substring matching with word-boundary regex in route_request()
- "fix the bug" now correctly routes to coder
- Multi-word patterns match if all words appear (any order)
- Add "timmy route" CLI command for debugging routing
- Add route_request_with_match() for pattern visibility
- Expand routing keywords in agents.yaml
- 22 new routing tests, all passing

config/agents.yaml

@@ -44,6 +44,11 @@ routing:
       - who is
       - news about
       - latest on
+      - explain
+      - how does
+      - what are
+      - compare
+      - difference between
     coder:
       - code
       - implement
@@ -55,6 +60,11 @@ routing:
       - programming
       - python
       - javascript
+      - fix
+      - bug
+      - lint
+      - type error
+      - syntax
     writer:
       - write
       - draft
@@ -63,6 +73,11 @@ routing:
       - blog post
       - readme
       - changelog
+      - edit
+      - proofread
+      - rewrite
+      - format
+      - template
     memory:
       - remember
       - recall