feat(mcp): add read_file tool and simplify edit/write returns

- edit_file: truncate diff to 15 lines, compact result format
- write_file: return only path/bytes/message
- read_file: new tool with multi-file, directory, regex support
  - paths: single file, array, or directory
  - pattern: glob filter (*.ts)
  - contentPattern: regex content search
  - maxDepth, maxFiles, includeContent options
- Update tool-strategy.md documentation

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ccw/src/templates/dashboard-js/main.js

@@ -79,7 +79,7 @@ document.addEventListener('DOMContentLoaded', async () => {
       }
 
       // Close task queue sidebar if open
-      if (isTaskQueueVisible && typeof toggleTaskQueueSidebar === 'function') {
+      if (isTaskQueueSidebarVisible && typeof toggleTaskQueueSidebar === 'function') {
         toggleTaskQueueSidebar();
       }
     }