fix: Disable unnecessary automation outputs during initial setup

Disabled two outputs that were causing errors during first commit:

1. implementation_gate (features.ai-rules.yml)
   - Was trying to generate implementation.discussion.md on every request.md commit
   - Should only run when feature status = READY_FOR_IMPLEMENTATION
   - Error: "Sanitized patch missing diff header"
   - Fix: Set enabled: false by default
   - Users can enable in project .ai-rules.yml when needed

2. readme normalizer (root.ai-rules.yml)
   - Was trying to update README.md whenever policies.yml was staged
   - Caused errors during initial commit
   - Error: "Sanitized patch missing diff header"
   - Fix: Set enabled: false by default
   - Users can enable when they want AI to maintain README

Benefits:
- Clean setup with no [runner] errors
- Faster first commit (fewer AI calls)
- Users can enable features incrementally as needed
- Only essential automation runs by default (feature discussions)

Remaining warnings are expected:
- [agents] warnings: Claude CLI permission prompts (normal behavior)
- [summary] warnings: Template markers not found (handled gracefully)

Testing:
Setup now completes cleanly with only feature.discussion.md generated.

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

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

assets/templates/rules/features.ai-rules.yml

@@ -14,8 +14,11 @@ rules:
         path: "Docs/features/{feature_id}/discussions/feature.discussion.md"
         output_type: "feature_discussion_writer"
       implementation_gate:
+        enabled: false  # Disabled by default - enable when feature is ready for implementation
         path: "Docs/features/{feature_id}/discussions/implementation.discussion.md"
         output_type: "implementation_gate_writer"
+        # To enable: set "enabled: true" in your project's .ai-rules.yml
+        # This prevents unnecessary AI calls during initial feature discussion phase
 
   feature_discussion_update:
     outputs:

assets/templates/rules/root.ai-rules.yml

@@ -9,6 +9,7 @@ rules:
   readme:
     outputs:
       normalize:
+        enabled: false  # Disabled by default - enable in your project when you want AI to maintain README
         path: "{repo}/README.md"
         output_type: "readme_normalizer"
         instruction: |