refactor: Replace TypeScript bootstrap with bash dependency checks

Simplified dependency installation by moving from TypeScript runtime bootstrap to bash-based checks in plugin manifest. This reduces complexity and code size while maintaining the same functionality.

Changes:
- Added bash conditional dependency checks to all 5 hooks in hooks.json
- Check runs before each hook: [ ! -d "${CLAUDE_PLUGIN_ROOT}/scripts/node_modules" ] && cd "${CLAUDE_PLUGIN_ROOT}/scripts" && npm install || true
- Reverted all hook TypeScript files to use simple static imports (removed dynamic imports)
- Removed src/shared/bootstrap.ts (44 lines)
- Removed ensureDependencies() calls from all hook entry points

Benefits:
- Simpler architecture using native bash instead of TypeScript
- Net reduction of 157 lines of code
- No runtime overhead when dependencies already installed
- Uses plugin manifest's command hook feature as intended
- Faster and more efficient

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

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

src/bin/hooks/context-hook.ts

@@ -4,16 +4,9 @@
  * Standalone executable for plugin hooks
  */
 
-// Bootstrap: Ensure dependencies are installed before importing modules
-import { ensureDependencies } from '../../shared/bootstrap.js';
+import { contextHook } from '../../hooks/context.js';
 import { stdin } from 'process';
 
-// Run bootstrap synchronously BEFORE any dynamic imports
-ensureDependencies();
-
-// Dynamic import AFTER bootstrap ensures dependencies are installed
-const { contextHook } = await import('../../hooks/context.js');
-
 try {
   if (stdin.isTTY) {
     const contextOutput = contextHook();