feat(npm): add postuninstall script

- add scripts/postuninstall.js for npm uninstall cleanup

- register in package.json scripts.postuninstall

- runs ccs --uninstall on npm uninstall -g

package.json

@@ -51,6 +51,7 @@
   "preferGlobal": true,
   "scripts": {
     "preinstall": "node scripts/preinstall.js",
+    "postuninstall": "node scripts/postuninstall.js",
     "build": "tsc && node scripts/add-shebang.js",
     "build:watch": "tsc --watch",
     "build:server": "tsc && node scripts/add-shebang.js",

scripts/postuninstall.js

@@ -0,0 +1,60 @@
+#!/usr/bin/env node
+/**
+ * CCS Postuninstall Script
+ *
+ * Cleans up WebSearch hook from ~/.claude/settings.json after npm uninstall.
+ * Self-contained, no external dependencies.
+ */
+
+const fs = require('fs');
+const path = require('path');
+const os = require('os');
+
+const SETTINGS_PATH = path.join(os.homedir(), '.claude', 'settings.json');
+
+function cleanupHook() {
+  try {
+    if (!fs.existsSync(SETTINGS_PATH)) {
+      return; // Nothing to clean
+    }
+
+    const content = fs.readFileSync(SETTINGS_PATH, 'utf8');
+    let settings;
+    try {
+      settings = JSON.parse(content);
+    } catch {
+      return; // Malformed JSON, don't touch
+    }
+
+    const hooks = settings.hooks;
+    if (!hooks?.PreToolUse) {
+      return; // No hooks to remove
+    }
+
+    const originalLength = hooks.PreToolUse.length;
+    hooks.PreToolUse = hooks.PreToolUse.filter((h) => {
+      if (h.matcher !== 'WebSearch') return true;
+      const command = h.hooks?.[0]?.command;
+      if (!command) return true;
+      return !command.includes('.ccs/hooks/websearch-transformer');
+    });
+
+    if (hooks.PreToolUse.length === originalLength) {
+      return; // Nothing changed
+    }
+
+    // Clean up empty structures
+    if (hooks.PreToolUse.length === 0) {
+      delete hooks.PreToolUse;
+    }
+    if (Object.keys(hooks).length === 0) {
+      delete settings.hooks;
+    }
+
+    fs.writeFileSync(SETTINGS_PATH, JSON.stringify(settings, null, 2), 'utf8');
+  } catch {
+    // Silent fail - not critical
+  }
+}
+
+cleanupHook();