Fix failing tests for agent framework updates

Updated test fixtures and expectations to match new agent naming:
- Fixed test registry to use correct agent names (setupRepository, keepaTodofile, keepaChangelog)
- Updated test assertions to expect new agent names instead of old ones
- Added missing category fields to test agent definitions
- Enhanced test registry with keepaChangelog agent for complete template testing

All 24 tests now pass:
- test_core.py: 6 tests ✅
- test_installer.py: 10 tests ✅
- test_registry.py: 8 tests ✅

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/kaizen_agentic/registry.py

@@ -256,33 +256,33 @@ class AgentRegistry:
         """Get predefined agent templates for different project types."""
         return {
             "python-basic": [
-                "setup-repository",
-                "todo-keeper",
-                "changelog-keeper"
+                "setupRepository",
+                "keepaTodofile",
+                "keepaChangelog"
             ],
             "python-web": [
-                "setup-repository",
+                "setupRepository",
                 "tdd-workflow",
                 "code-refactoring",
-                "todo-keeper",
-                "changelog-keeper",
-                "contributing-keeper"
+                "keepaTodofile",
+                "keepaChangelog",
+                "keepaContributingfile"
             ],
             "python-cli": [
-                "setup-repository",
+                "setupRepository",
                 "tdd-workflow",
                 "testing-efficiency",
                 "claude-documentation",
-                "todo-keeper",
-                "changelog-keeper"
+                "keepaTodofile",
+                "keepaChangelog"
             ],
             "python-data": [
-                "setup-repository",
+                "setupRepository",
                 "datamodel-optimization",
                 "testing-efficiency",
                 "requirements-engineering",
-                "todo-keeper",
-                "changelog-keeper"
+                "keepaTodofile",
+                "keepaChangelog"
             ],
             "comprehensive": [
                 agent.name for agent in self.list_agents()