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/views/history.js

@@ -94,7 +94,7 @@ async function renderCliHistoryView() {
           '<button class="btn-icon" onclick="event.stopPropagation(); showExecutionDetail(\'' + exec.id + '\')" title="View Details">' +
             '<i data-lucide="eye" class="w-4 h-4"></i>' +
           '</button>' +
-          '<button class="btn-icon btn-danger" onclick="event.stopPropagation(); confirmDeleteExecution(\'' + exec.id + '\')" title="Delete">' +
+          '<button class="btn-icon btn-danger" onclick="event.stopPropagation(); confirmDeleteExecution(\'' + exec.id + (exec.sourceDir ? '\',\'' + escapeHtml(exec.sourceDir) : '') + '\')" title="Delete">' +
             '<i data-lucide="trash-2" class="w-4 h-4"></i>' +
           '</button>' +
         '</div>' +