fix: optimize agent compiler and complete handler cleanup

- Add deployment-aware handler generation (filters web-only/ide-only commands)
- Remove unused run-workflow handler type (ghost handler cleanup)
- Implement missing validate-workflow and data handler generation
- Update schema validation to support exactly 6 active handler types
- Clean up activation templates and web bundler logic
- Prevent generation of unused handler instructions for better performance
- All 62 tests pass with backward compatibility maintained

test/fixtures/agent-schema/valid/menu-commands/all-command-types.agent.yaml

@@ -34,6 +34,4 @@ agent:
     - trigger: data-test
       description: Test data command
       data: path/to/data
-    - trigger: run-workflow-test
-      description: Test run-workflow command
-      run-workflow: path/to/workflow
+