feat: Add context_cache MCP tool with simplified CLI options

Add context_cache MCP tool for caching files by @patterns:
- pattern-parser.ts: Parse @expressions using glob
- context-cache-store.ts: In-memory cache with TTL/LRU
- context-cache.ts: MCP tool with pack/read/status/release/cleanup

Simplify CLI cache options:
- --cache now uses comma-separated format instead of JSON
- Items starting with @ are patterns, others are text content
- Add --inject-mode option (none/full/progressive)
- Default: codex=full, gemini/qwen=none

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

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

ccw/src/tools/index.ts

@@ -22,6 +22,7 @@ import { executeInitWithProgress } from './smart-search.js';
 // codex_lens removed - functionality integrated into smart_search
 import * as readFileMod from './read-file.js';
 import * as coreMemoryMod from './core-memory.js';
+import * as contextCacheMod from './context-cache.js';
 import type { ProgressInfo } from './codex-lens.js';
 
 // Import legacy JS tools
@@ -357,6 +358,7 @@ registerTool(toLegacyTool(smartSearchMod));
 // codex_lens removed - functionality integrated into smart_search
 registerTool(toLegacyTool(readFileMod));
 registerTool(toLegacyTool(coreMemoryMod));
+registerTool(toLegacyTool(contextCacheMod));
 
 // Register legacy JS tools
 registerTool(uiGeneratePreviewTool);