fix: update remaining .feedback references to feedback

Update directory structure diagrams and copy examples to use
the new visible feedback/ directory instead of hidden .feedback/

This ensures all documentation is consistent with the
ReusableCapabilitiesArchitecture v0.1 specification.

CLAUDE.md

@@ -259,7 +259,7 @@ The feedback system consists of:
 ### Directory Structure
 
 ```
-.feedback/
+feedback/
 ├── inbound/         # New feedback from users (unreviewed)
 ├── reviewed/        # Feedback reviewed by maintainers
 ├── archived/        # Resolved or outdated feedback
@@ -361,7 +361,7 @@ The feedback system is **capability-agnostic** and can be copied to any markitec
 1. **Copy the pattern:**
    ```bash
    mkdir -p feedback/inbound feedback/reviewed feedback/archived
-   cp /path/to/feedback-template/README.md .feedback/
+   cp /path/to/feedback-template/README.md feedback/
    cp /path/to/feedback-template/feedback .capability/
    chmod +x .capability/feedback
    ```

feedback/README.md

@@ -17,7 +17,7 @@ This capability uses the **feedback pattern** - a simple, reusable approach for
 ## Directory Structure
 
 ```
-.feedback/
+feedback/
 ├── inbound/         # New feedback awaiting review
 ├── reviewed/        # Feedback that's been reviewed (optional)
 ├── archived/        # Old/resolved feedback (optional)
@@ -305,7 +305,7 @@ Thanks for the great tool!
 mkdir -p feedback/inbound feedback/reviewed feedback/archived
 
 # 2. Copy this README
-cp /path/to/feedback/template/README.md .feedback/
+cp /path/to/feedback/template/README.md feedback/
 
 # 3. Add to .gitignore (optional - feedback can be committed or ignored)
 echo "feedback/inbound/*.md" >> .gitignore