diff --git a/dist/cli.js b/dist/cli.js
index e0e02a2..c62b117 100644
--- a/dist/cli.js
+++ b/dist/cli.js
@@ -33,7 +33,7 @@ var __toESM = (mod, isNodeMode, target) => {
 var __commonJS = (cb, mod) => () => (mod || cb((mod = { exports: {} }).exports, mod), mod.exports);
 var __require = /* @__PURE__ */ createRequire(import.meta.url);
 
-// ../../node_modules/commander/lib/error.js
+// node_modules/commander/lib/error.js
 var require_error = __commonJS((exports) => {
   class CommanderError extends Error {
     constructor(exitCode, code, message) {
@@ -57,7 +57,7 @@ var require_error = __commonJS((exports) => {
   exports.InvalidArgumentError = InvalidArgumentError;
 });
 
-// ../../node_modules/commander/lib/argument.js
+// node_modules/commander/lib/argument.js
 var require_argument = __commonJS((exports) => {
   var { InvalidArgumentError } = require_error();
 
@@ -136,7 +136,7 @@ var require_argument = __commonJS((exports) => {
   exports.humanReadableArgName = humanReadableArgName;
 });
 
-// ../../node_modules/commander/lib/help.js
+// node_modules/commander/lib/help.js
 var require_help = __commonJS((exports) => {
   var { humanReadableArgName } = require_argument();
 
@@ -385,7 +385,7 @@ var require_help = __commonJS((exports) => {
   exports.Help = Help;
 });
 
-// ../../node_modules/commander/lib/option.js
+// node_modules/commander/lib/option.js
 var require_option = __commonJS((exports) => {
   var { InvalidArgumentError } = require_error();
 
@@ -536,7 +536,7 @@ var require_option = __commonJS((exports) => {
   exports.DualOptions = DualOptions;
 });
 
-// ../../node_modules/commander/lib/suggestSimilar.js
+// node_modules/commander/lib/suggestSimilar.js
 var require_suggestSimilar = __commonJS((exports) => {
   var maxDistance = 3;
   function editDistance(a, b) {
@@ -609,7 +609,7 @@ var require_suggestSimilar = __commonJS((exports) => {
   exports.suggestSimilar = suggestSimilar;
 });
 
-// ../../node_modules/commander/lib/command.js
+// node_modules/commander/lib/command.js
 var require_command = __commonJS((exports) => {
   var EventEmitter = __require("node:events").EventEmitter;
   var childProcess = __require("node:child_process");
@@ -1852,7 +1852,7 @@ Expecting one of '${allowedValues.join("', '")}'`);
   exports.Command = Command;
 });
 
-// ../../node_modules/commander/index.js
+// node_modules/commander/index.js
 var require_commander = __commonJS((exports) => {
   var { Argument } = require_argument();
   var { Command } = require_command();
@@ -1878,7 +1878,7 @@ import { fileURLToPath } from "url";
 import { dirname, join } from "path";
 import { createInterface } from "readline/promises";
 
-// ../../node_modules/commander/esm.mjs
+// node_modules/commander/esm.mjs
 var import__ = __toESM(require_commander(), 1);
 var {
   program,
@@ -1895,7 +1895,7 @@ var {
 } = import__.default;
 
 // src/install.ts
-import fs from "fs/promises";
+import fs2 from "fs/promises";
 
 // src/utils/logger.ts
 var c = {
@@ -1965,6 +1965,7 @@ var logger = new Logger;
 // src/utils/paths.ts
 import path from "path";
 import os from "os";
+import fs from "fs/promises";
 function getHomeDir() {
   if (process.env.HOME) {
     return process.env.HOME;
@@ -1990,13 +1991,28 @@ function getConfig() {
 function toGitPath(filePath) {
   return filePath.replace(/\\/g, "/");
 }
+async function pathExists(filePath) {
+  try {
+    await fs.access(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+}
 
 // src/pattern-catalog.json
 var pattern_catalog_default = [
   {
     id: "claude",
     signatureAliases: ["Claude", "Anthropic"],
-    authorTokens: ["claude", "claude code", "claude opus", "claude sonnet", "claude haiku", "anthropic"],
+    authorTokens: [
+      "claude",
+      "claude code",
+      "claude opus",
+      "claude sonnet",
+      "claude haiku",
+      "anthropic"
+    ],
     emails: ["noreply@anthropic.com", "claude@anthropic.com"]
   },
   {
@@ -2101,10 +2117,7 @@ function buildNamePattern(aliases) {
   return `${CO_AUTHORED_BY_PREFIX}(?:${aliases.map(escapeRegex).join("|")}).*`;
 }
 function buildEmailPattern(emails, emailPatterns) {
-  const emailAlternatives = [
-    ...emails.map(escapeRegex),
-    ...emailPatterns
-  ];
+  const emailAlternatives = [...emails.map(escapeRegex), ...emailPatterns];
   return `${CO_AUTHORED_BY_PREFIX}.*\\b(?:${emailAlternatives.join("|")})\\b.*`;
 }
 var AI_SIGNATURE_CATALOG = pattern_catalog_default;
@@ -2280,6 +2293,11 @@ function createHookInstallPlan(options) {
     ]
   };
 }
+var NOCO_HOOK_MARKERS = ["Generated by noco", "nococli:"];
+var HOOK_BACKUP_EXT = ".bak";
+function isNococliHook(content) {
+  return NOCO_HOOK_MARKERS.some((marker) => content.includes(marker));
+}
 function getPatternNames() {
   return DEFAULT_AI_PATTERNS.map((pattern) => pattern.name);
 }
@@ -2380,7 +2398,7 @@ async function install(options = {}) {
   const platform = options.platform ?? process.platform;
   try {
     logger2.info("Creating git templates directory...");
-    await fs.mkdir(config.hooksDir, { recursive: true });
+    await fs2.mkdir(config.hooksDir, { recursive: true });
     const powerShellRuntime = detectPowerShellRuntime(platform);
     if (platform === "win32" && !powerShellRuntime) {
       return {
@@ -2393,8 +2411,20 @@ async function install(options = {}) {
       platform,
       powerShellCommand: powerShellRuntime ?? undefined
     });
+    if (!options.force) {
+      for (const file of installPlan.files) {
+        try {
+          const existingContent = await fs2.readFile(file.path, "utf8");
+          if (!isNococliHook(existingContent)) {
+            const backupPath = `${file.path}${HOOK_BACKUP_EXT}`;
+            await fs2.copyFile(file.path, backupPath);
+            logger2.warning(`Existing hook backed up to ${backupPath}`);
+          }
+        } catch {}
+      }
+    }
     for (const file of installPlan.files) {
-      await fs.writeFile(file.path, file.content, {
+      await fs2.writeFile(file.path, file.content, {
         mode: file.mode
       });
       logger2.success(`Hook file created at ${file.path}`);
@@ -2444,7 +2474,7 @@ async function install(options = {}) {
 }
 
 // src/uninstall.ts
-import fs2 from "fs/promises";
+import fs3 from "fs/promises";
 async function uninstall(options = {}) {
   const logger2 = new Logger(options.silent);
   const config = getConfig();
@@ -2453,32 +2483,37 @@ async function uninstall(options = {}) {
   try {
     logger2.info("Removing hook file...");
     try {
-      await fs2.unlink(config.hookFile);
+      await fs3.unlink(config.hookFile);
       logger2.success(`Removed ${config.hookFile}`);
     } catch {
       logger2.info("Hook file not found (already removed?)");
     }
     try {
-      await fs2.unlink(config.powerShellHookFile);
+      await fs3.unlink(config.powerShellHookFile);
       removedPowerShellHook = true;
       logger2.success(`Removed ${config.powerShellHookFile}`);
     } catch {
       logger2.info("PowerShell hook file not found (already removed?)");
     }
+    for (const hookPath of [config.hookFile, config.powerShellHookFile]) {
+      const backupPath = `${hookPath}${HOOK_BACKUP_EXT}`;
+      try {
+        await fs3.rename(backupPath, hookPath);
+        logger2.success(`Restored previous hook from ${backupPath}`);
+      } catch {}
+    }
     try {
-      const hooksExists = await fs2.access(config.hooksDir).then(() => true).catch(() => false);
-      if (hooksExists) {
-        const files = await fs2.readdir(config.hooksDir);
+      if (await pathExists(config.hooksDir)) {
+        const files = await fs3.readdir(config.hooksDir);
         if (files.length === 0) {
-          await fs2.rmdir(config.hooksDir);
+          await fs3.rmdir(config.hooksDir);
           logger2.info("Removed empty hooks directory");
         }
       }
-      const templateExists = await fs2.access(config.templateDir).then(() => true).catch(() => false);
-      if (templateExists) {
-        const files = await fs2.readdir(config.templateDir);
+      if (await pathExists(config.templateDir)) {
+        const files = await fs3.readdir(config.templateDir);
         if (files.length === 0) {
-          await fs2.rmdir(config.templateDir);
+          await fs3.rmdir(config.templateDir);
           logger2.info("Removed empty templates directory");
         }
       }
@@ -2515,7 +2550,6 @@ async function uninstall(options = {}) {
 }
 
 // src/cli.ts
-import { access } from "fs/promises";
 var logger2 = new Logger;
 var __dirname2 = dirname(fileURLToPath(import.meta.url));
 var version = "0.0.0";
@@ -2536,14 +2570,6 @@ async function promptConfirm(message) {
   rl.close();
   return answer.toLowerCase() === "y" || answer.toLowerCase() === "yes";
 }
-async function fileExists(filePath) {
-  try {
-    await access(filePath);
-    return true;
-  } catch {
-    return false;
-  }
-}
 async function runInstallCommand(options) {
   const currentName = getGitUserName();
   if (currentName.exists && currentName.value && isAIAuthor(currentName.value)) {
@@ -2574,7 +2600,7 @@ async function runInstallCommand(options) {
   } else {
     logger2.info("No existing template directory found");
   }
-  const result = await install({ silent: options.silent });
+  const result = await install({ silent: options.silent, force: options.force });
   if (!result.success) {
     logger2.blank();
     logger2.error(result.message);
@@ -2630,8 +2656,8 @@ program2.command("status").description("Check if noco is properly installed and
   } else {
     logger2.warning("Not installed");
   }
-  const hookExists = await fileExists(config.hookFile);
-  const powerShellHookExists = await fileExists(config.powerShellHookFile);
+  const hookExists = await pathExists(config.hookFile);
+  const powerShellHookExists = await pathExists(config.powerShellHookFile);
   if (hookExists) {
     logger2.success("Hook entrypoint exists");
   } else {
diff --git a/package.json b/package.json
index 86f5925..9b67114 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "nococli",
   "version": "1.1.0",
-  "description": "Keep your code yours — remove AI co-author signatures from git commits",
+  "description": "Keep your code yours -- remove AI co-author signatures from git commits",
   "type": "module",
   "bin": {
     "noco": "./dist/cli.js"
diff --git a/scripts/e2e-install.mjs b/scripts/e2e-install.mjs
index a53d026..68b8e70 100644
--- a/scripts/e2e-install.mjs
+++ b/scripts/e2e-install.mjs
@@ -233,7 +233,7 @@ Co-Authored-By: Claude <claude@anthropic.com>`;
       `AI signature should be removed. Got: ${lastMessage}`);
     assert.ok(lastMessage.includes('feat: add new feature'), 
       'Message body should be preserved');
-    console.log('✓ Basic signature removal works');
+    console.log('Basic signature removal works');
   }
 
   // =========================================================================
@@ -263,7 +263,7 @@ Co-Authored-By: Claude <claude@anthropic.com>`;
       assert.ok(!containsAISignature(lastMessage), 
         `Case variation "${testCase.label}" should be removed. Got: ${lastMessage}`);
     }
-    console.log('✓ All case variations are matched and removed');
+    console.log('All case variations are matched and removed');
   }
 
   // =========================================================================
@@ -305,7 +305,7 @@ Co-Authored-By: Claude <claude@anthropic.com>`;
       assert.ok(!containsAISignature(lastMessage), 
         `AI signature "${ai.name}" should be removed. Got: ${lastMessage}`);
     }
-    console.log(`✓ All ${aiNames.length} AI names are matched and removed`);
+    console.log(`All ${aiNames.length} AI names are matched and removed`);
   }
 
   // =========================================================================
@@ -334,7 +334,7 @@ Co-Authored-By: Cursor AI <cursor@cursor.sh>`;
       `All AI signatures should be removed. Got: ${lastMessage}`);
     assert.ok(lastMessage.includes('feat: add new feature'), 
       'Message body should be preserved');
-    console.log('✓ Multiple AI signatures are all removed');
+    console.log('Multiple AI signatures are all removed');
   }
 
   // =========================================================================
@@ -364,7 +364,7 @@ Co-Authored-By: GitHub Copilot <copilot@github.com>`;
       'Human co-author John Doe should be preserved');
     assert.ok(containsHumanCoAuthor(lastMessage, 'Jane Smith'), 
       'Human co-author Jane Smith should be preserved');
-    console.log('✓ AI signatures removed, human co-authors preserved');
+    console.log('AI signatures removed, human co-authors preserved');
   }
 
   // =========================================================================
@@ -393,7 +393,7 @@ Co-Authored-By: GitHub Copilot <copilot@github.com>`;
       assert.ok(!containsAISignature(lastMessage), 
         `Whitespace variation "${testCase.label}" should be removed. Got: ${lastMessage}`);
     }
-    console.log('✓ All whitespace variations are handled');
+    console.log('All whitespace variations are handled');
   }
 
   // =========================================================================
@@ -425,7 +425,7 @@ Co-Authored-By: Claude <claude@anthropic.com>
       `Trailing blank lines should be cleaned. Got ending with: ${JSON.stringify(lastMessage.slice(-20))}`);
     assert.ok(!containsAISignature(lastMessage), 
       'AI signature should be removed');
-    console.log('✓ Trailing blank lines are cleaned up');
+    console.log('Trailing blank lines are cleaned up');
   }
 
   // =========================================================================
@@ -467,7 +467,7 @@ Fixes #123`;
       'List items should be preserved');
     assert.ok(lastMessage.includes('Fixes #123'), 
       'Trailer should be preserved');
-    console.log('✓ Message integrity preserved');
+    console.log('Message integrity preserved');
   }
 
   // =========================================================================
@@ -490,7 +490,7 @@ Fixes #123`;
     assertSuccess(result3, 'install with --force');
     
     assertHookArtifacts(env);
-    console.log('✓ Installation idempotency verified');
+    console.log('Installation idempotency verified');
   }
 
   // =========================================================================
@@ -522,7 +522,7 @@ Fixes #123`;
     const uninstallWithConfigResult = runNode([cliPath, 'uninstall', '--silent', '--remove-config'], { env });
     assertSuccess(uninstallWithConfigResult, 'uninstall with --remove-config');
     
-    console.log('✓ Uninstallation commands verified');
+    console.log('Uninstallation commands verified');
   }
 
   // =========================================================================
@@ -554,7 +554,7 @@ Fixes #123`;
     assert.ok(!containsAISignature(lastMessage), 
       `Signature should be removed in full flow. Got: ${lastMessage}`);
     
-    console.log('✓ Full installation and commit flow verified');
+    console.log('Full installation and commit flow verified');
   }
 
   // =========================================================================
@@ -590,7 +590,7 @@ Fixes #123`;
     const lastMessage = getLastCommitMessage(repoDir, env);
     assert.ok(!containsAISignature(lastMessage), 'Signature should be removed');
     
-    console.log('✓ Existing repository hook application verified');
+    console.log('Existing repository hook application verified');
   }
 
   // =========================================================================
@@ -623,7 +623,7 @@ Fixes #123`;
     const lastMessage = getLastCommitMessage(repoDir, env);
     assert.ok(lastMessage.includes('John Doe'), 'Human co-author should be preserved');
     
-    console.log('✓ Hook non-blocking behavior verified');
+    console.log('Hook non-blocking behavior verified');
   }
 
   // =========================================================================
@@ -656,7 +656,7 @@ Fixes #123`;
     assert.ok(!containsAISignature(allMessagesResult.stdout), 
       'All commit messages should be clean of AI signatures');
     
-    console.log('✓ Concurrent hook safety verified');
+    console.log('Concurrent hook safety verified');
   }
 
   // =========================================================================
@@ -678,7 +678,7 @@ Fixes #123`;
     
     assertSuccess(commitResult, 'performance commit');
     assert.ok(elapsed < 5000, `Hook should complete quickly (took ${elapsed}ms)`);
-    console.log(`✓ Hook performance: ${elapsed}ms (target < 5000ms)`);
+    console.log(`Hook performance: ${elapsed}ms (target < 5000ms)`);
   }
 
   // =========================================================================
@@ -711,7 +711,7 @@ Fixes #123`;
     assert.ok(!containsAISignature(lastMessage), 
       `All AI signatures should be removed from amended commit. Got: ${lastMessage}`);
     
-    console.log('✓ Amended commit handling verified');
+    console.log('Amended commit handling verified');
   }
 
   // =========================================================================
@@ -770,7 +770,7 @@ Fixes #123`;
     assert.ok(!containsAISignature(lastMessage), 
       `AI signatures should be removed from rebased commit. Got: ${lastMessage}`);
     
-    console.log('✓ Interactive rebase safety verified');
+    console.log('Interactive rebase safety verified');
   }
 
   // =========================================================================
@@ -799,7 +799,7 @@ Fixes #123`;
       assert.ok(hookContent.includes("require('fs')"), 'Hook should use Node.js fs');
     }
     
-    console.log('✓ Platform-specific installation verified');
+    console.log('Platform-specific installation verified');
   }
 
   // =========================================================================
@@ -831,7 +831,7 @@ Fixes #123`;
     assert.ok(!containsAISignature(lastMessage), 
       'Signature should be removed in CI environment');
     
-    console.log('✓ CI/CD environment compatibility verified');
+    console.log('CI/CD environment compatibility verified');
   }
 
   // =========================================================================
@@ -880,7 +880,7 @@ Fixes #123`;
     assert.ok(lastMessage.includes("Merge branch 'feature-branch'"), 
       'Merge message should be preserved');
     
-    console.log('✓ Merge commit handling verified');
+    console.log('Merge commit handling verified');
   }
 
   console.log('\n========================================');
diff --git a/src/cli.ts b/src/cli.ts
index 01b0429..7979b2d 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -18,11 +18,10 @@ import {
   setGitUserName,
   setGitUserEmail,
 } from './utils/git.js';
-import { getConfig } from './utils/paths.js';
+import { getConfig, pathExists } from './utils/paths.js';
 import { Logger } from './utils/logger.js';
 import { detectPowerShellRuntime } from './utils/runtime.js';
 import { isAIAuthor } from './types.js';
-import { access } from 'fs/promises';
 
 const logger = new Logger();
 
@@ -52,15 +51,6 @@ async function promptConfirm(message: string): Promise<boolean> {
   return answer.toLowerCase() === 'y' || answer.toLowerCase() === 'yes';
 }
 
-async function fileExists(filePath: string): Promise<boolean> {
-  try {
-    await access(filePath);
-    return true;
-  } catch {
-    return false;
-  }
-}
-
 async function runInstallCommand(options: { force?: boolean; silent?: boolean }): Promise<void> {
   // Check if current git author is an AI
   const currentName = getGitUserName();
@@ -186,8 +176,8 @@ program
       logger.warning('Not installed');
     }
 
-    const hookExists = await fileExists(config.hookFile);
-    const powerShellHookExists = await fileExists(config.powerShellHookFile);
+    const hookExists = await pathExists(config.hookFile);
+    const powerShellHookExists = await pathExists(config.powerShellHookFile);
 
     if (hookExists) {
       logger.success('Hook entrypoint exists');
diff --git a/src/install.ts b/src/install.ts
index a63627c..7ab7f97 100644
--- a/src/install.ts
+++ b/src/install.ts
@@ -4,8 +4,8 @@
 
 import fs from 'fs/promises';
 import { Logger } from './utils/logger.js';
-import { getConfig, toGitPath, pathExists } from './utils/paths.js';
-import { createHookInstallPlan, isNococliHook } from './utils/hook.js';
+import { getConfig, toGitPath } from './utils/paths.js';
+import { createHookInstallPlan, isNococliHook, HOOK_BACKUP_EXT } from './utils/hook.js';
 import { getTemplateDir, setTemplateDir } from './utils/git.js';
 import { detectPowerShellRuntime } from './utils/runtime.js';
 import type { InstallOptions } from './types.js';
@@ -44,16 +44,17 @@ export async function install(options: InstallOptions = {}): Promise<InstallResu
       powerShellCommand: powerShellRuntime ?? undefined,
     });
 
-    // Backup existing hooks that are not from nococli
     if (!options.force) {
       for (const file of installPlan.files) {
-        if (await pathExists(file.path)) {
+        try {
           const existingContent = await fs.readFile(file.path, 'utf8');
           if (!isNococliHook(existingContent)) {
-            const backupPath = `${file.path}.bak`;
+            const backupPath = `${file.path}${HOOK_BACKUP_EXT}`;
             await fs.copyFile(file.path, backupPath);
             logger.warning(`Existing hook backed up to ${backupPath}`);
           }
+        } catch {
+          // File does not exist — no backup needed
         }
       }
     }
diff --git a/src/uninstall.ts b/src/uninstall.ts
index 54bcc92..3ab9a98 100644
--- a/src/uninstall.ts
+++ b/src/uninstall.ts
@@ -5,6 +5,7 @@
 import fs from 'fs/promises';
 import { Logger } from './utils/logger.js';
 import { getConfig, pathExists } from './utils/paths.js';
+import { HOOK_BACKUP_EXT } from './utils/hook.js';
 import { unsetGitConfig } from './utils/git.js';
 import type { UninstallOptions } from './types.js';
 import type { HookMode } from './types.js';
@@ -39,21 +40,18 @@ export async function uninstall(options: UninstallOptions = {}): Promise<Uninsta
       logger.info('PowerShell hook file not found (already removed?)');
     }
 
-    // Restore backups if they exist
     for (const hookPath of [config.hookFile, config.powerShellHookFile]) {
-      const backupPath = `${hookPath}.bak`;
-      if (await pathExists(backupPath)) {
+      const backupPath = `${hookPath}${HOOK_BACKUP_EXT}`;
+      try {
         await fs.rename(backupPath, hookPath);
         logger.success(`Restored previous hook from ${backupPath}`);
+      } catch {
+        // No backup exists — nothing to restore
       }
     }
 
     try {
-      const hooksExists = await fs
-        .access(config.hooksDir)
-        .then(() => true)
-        .catch(() => false);
-      if (hooksExists) {
+      if (await pathExists(config.hooksDir)) {
         const files = await fs.readdir(config.hooksDir);
         if (files.length === 0) {
           await fs.rmdir(config.hooksDir);
@@ -61,11 +59,7 @@ export async function uninstall(options: UninstallOptions = {}): Promise<Uninsta
         }
       }
 
-      const templateExists = await fs
-        .access(config.templateDir)
-        .then(() => true)
-        .catch(() => false);
-      if (templateExists) {
+      if (await pathExists(config.templateDir)) {
         const files = await fs.readdir(config.templateDir);
         if (files.length === 0) {
           await fs.rmdir(config.templateDir);
diff --git a/src/utils/hook.test.ts b/src/utils/hook.test.ts
index f08ee61..18fd517 100644
--- a/src/utils/hook.test.ts
+++ b/src/utils/hook.test.ts
@@ -10,7 +10,7 @@ import {
 import { AI_AUTHOR_NAMES, AI_SIGNATURE_CATALOG } from '../types';
 
 /**
- * Unit tests for nococli hook — Node.js cross-platform hook
+ * Unit tests for nococli hook -- Node.js cross-platform hook
  */
 
 const windowsConfig = {
@@ -301,8 +301,8 @@ describe('Pattern Matching - Mixed AI and Human Co-Authors (VAL-PATTERN-007)', (
     const emailRegex = new RegExp(patterns[1].pattern, 'i');
 
     // These have AI-sounding names but human emails
-    // Name pattern matches (greedy .*) — known false positive
-    // Email pattern does NOT match — provides safety net
+    // Name pattern matches (greedy .*) -- known false positive
+    // Email pattern does NOT match -- provides safety net
     const humanWithAIName = [
       'Co-Authored-By: Claude Smith <claude.smith@company.com>',
       'Co-Authored-By: Gemini Wong <gemini.wong@company.com>',
@@ -310,9 +310,9 @@ describe('Pattern Matching - Mixed AI and Human Co-Authors (VAL-PATTERN-007)', (
     ];
 
     humanWithAIName.forEach((human) => {
-      // Name pattern still matches — known limitation
+      // Name pattern still matches -- known limitation
       expect(nameRegex.test(human)).toBe(true);
-      // Email pattern does NOT match — email-based safety net
+      // Email pattern does NOT match -- email-based safety net
       expect(emailRegex.test(human)).toBe(false);
     });
   });
diff --git a/src/utils/hook.ts b/src/utils/hook.ts
index 371c60b..cdbe476 100644
--- a/src/utils/hook.ts
+++ b/src/utils/hook.ts
@@ -220,15 +220,12 @@ export function createHookInstallPlan(options: HookInstallPlanOptions): HookInst
   };
 }
 
-/**
- * Markers used to identify a nococli-generated hook file.
- * Covers both Node.js (//) and PowerShell (#) comment styles.
- */
+/** Markers that identify a nococli-generated hook file. */
 export const NOCO_HOOK_MARKERS = ['Generated by noco', 'nococli:'] as const;
 
-/**
- * Check if hook content was generated by nococli.
- */
+/** File extension used for backing up existing hooks before overwrite. */
+export const HOOK_BACKUP_EXT = '.bak';
+
 export function isNococliHook(content: string): boolean {
   return NOCO_HOOK_MARKERS.some((marker) => content.includes(marker));
 }
diff --git a/test.sh b/test.sh
index c591fb6..355bc2b 100644
--- a/test.sh
+++ b/test.sh
@@ -1,25 +1,25 @@
 #!/bin/bash
 # Test script to verify git-no-ai-author hook works
 
-echo "🧪 Testing git-no-ai-author hook..."
+echo "Testing git-no-ai-author hook..."
 echo ""
 
 # Create temp directory
 TEMP_DIR=$(mktemp -d)
 cd "$TEMP_DIR" || exit 1
 
-echo "📁 Created test directory: $TEMP_DIR"
+echo "Created test directory: $TEMP_DIR"
 
 # Initialize git repo
 git init > /dev/null 2>&1
 
-echo "✓ Initialized git repo"
+echo "Initialized git repo"
 
 # Check if hook exists
 if [ -f ".git/hooks/commit-msg" ]; then
-    echo "✓ Hook file exists"
+    echo "Hook file exists"
 else
-    echo "✗ Hook file NOT found!"
+    echo "Hook file NOT found!"
     echo "  Make sure git template directory is set correctly:"
     echo "  git config --global init.templatedir"
     exit 1
@@ -41,22 +41,22 @@ git commit -m "$COMMIT_MSG" > /dev/null 2>&1
 ACTUAL_MSG=$(git log -1 --format=%B)
 
 echo ""
-echo "📝 Commit message:"
-echo "────────────────────────────────────────"
+echo "Commit message:"
+echo "----------------------------------------"
 echo "$ACTUAL_MSG"
-echo "────────────────────────────────────────"
+echo "----------------------------------------"
 echo ""
 
 # Check if AI co-author was removed
 if echo "$ACTUAL_MSG" | grep -q "Co-Authored-By: Claude"; then
-    echo "❌ FAILED: AI co-author was NOT removed"
+    echo "FAILED: AI co-author was NOT removed"
     exit 1
 else
-    echo "✅ PASSED: AI co-author was removed successfully!"
+    echo "PASSED: AI co-author was removed successfully!"
 fi
 
 # Cleanup
 cd -
 rm -rf "$TEMP_DIR"
 echo ""
-echo "🧹 Cleaned up test directory"
+echo "Cleaned up test directory"