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

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

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

ccw/src/tools/index.ts

@@ -19,6 +19,7 @@ import * as sessionManagerMod from './session-manager.js';
 import * as cliExecutorMod from './cli-executor.js';
 import * as smartSearchMod from './smart-search.js';
 import * as codexLensMod from './codex-lens.js';
+import * as readFileMod from './read-file.js';
 
 // Import legacy JS tools
 import { uiGeneratePreviewTool } from './ui-generate-preview.js';
@@ -297,6 +298,7 @@ registerTool(toLegacyTool(sessionManagerMod));
 registerTool(toLegacyTool(cliExecutorMod));
 registerTool(toLegacyTool(smartSearchMod));
 registerTool(toLegacyTool(codexLensMod));
+registerTool(toLegacyTool(readFileMod));
 
 // Register legacy JS tools
 registerTool(uiGeneratePreviewTool);