feat: add keybinding-customization patch to bypass feature flag gate

Custom keybindings from ~/.claude/keybindings.json are blocked when
CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1 because the feature flag
tengu_keybinding_customization_release defaults to false without
GrowthBook. This patch force-enables the gate function.

Author: VitalyOstanin

src/patches/index.ts

@@ -73,6 +73,7 @@ import { writeWorktreeMode } from './worktreeMode';
 import { writeAllowCustomAgentModels } from './allowCustomAgentModels';
 import { writeVoiceMode } from './voiceMode';
 import { writeChannelsMode } from './channelsMode';
+import { writeKeybindingCustomization } from './keybindingCustomization';
 import {
   restoreNativeBinaryFromBackup,
   restoreClijsFromBackup,
@@ -174,6 +175,13 @@ const PATCH_DEFINITIONS = [
     group: PatchGroup.ALWAYS_APPLIED,
     description: `Statusline updates will be properly throttled instead of queued (or debounced)`,
   },
+  {
+    id: 'keybinding-customization',
+    name: 'Keybinding customization',
+    group: PatchGroup.ALWAYS_APPLIED,
+    description:
+      'Force-enable custom keybindings when CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1',
+  },
   // Misc Configurable
   {
     id: 'model-customizations',
@@ -663,6 +671,9 @@ export const applyCustomization = async (
         ),
       condition: config.settings.misc?.statuslineThrottleMs != null,
     },
+    'keybinding-customization': {
+      fn: c => writeKeybindingCustomization(c),
+    },
     // Misc Configurable
     'patches-applied-indication': {
       fn: c =>

src/patches/keybindingCustomization.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from 'vitest';
+
+import { writeKeybindingCustomization } from './keybindingCustomization';
+
+describe('keybindingCustomization', () => {
+  it('bypasses the keybinding customization gate', () => {
+    const file =
+      'const x=1;' +
+      'function lE(){return u$("tengu_keybinding_customization_release",!1)}' +
+      'function DLK(H){let $=new Date()}';
+
+    const result = writeKeybindingCustomization(file);
+
+    expect(result).not.toBeNull();
+    expect(result).toContain(
+      'function lE(){return !0;return u$("tengu_keybinding_customization_release",!1)}'
+    );
+  });
+
+  it('returns unchanged file when already patched', () => {
+    const file =
+      'const x=1;' +
+      'function lE(){return !0;return u$("tengu_keybinding_customization_release",!1)}' +
+      'function DLK(H){let $=new Date()}';
+
+    const result = writeKeybindingCustomization(file);
+
+    expect(result).toBe(file);
+  });
+
+  it('returns null when the gate pattern is absent', () => {
+    expect(writeKeybindingCustomization('const x=1;')).toBeNull();
+  });
+});

src/patches/keybindingCustomization.ts

@@ -0,0 +1,36 @@
+import { showDiff } from './index';
+import { debug } from '../utils';
+
+export const writeKeybindingCustomization = (
+  oldFile: string
+): string | null => {
+  const alreadyPatched =
+    /function [$\w]+\(\)\{return !0;return [$\w]+\("tengu_keybinding_customization_release"/;
+
+  if (alreadyPatched.test(oldFile)) {
+    debug('patch: keybindingCustomization: already patched');
+    return oldFile;
+  }
+
+  const pattern =
+    /function [$\w]+\(\)\{return [$\w]+\("tengu_keybinding_customization_release"/;
+
+  const match = oldFile.match(pattern);
+
+  if (!match || match.index === undefined) {
+    debug(
+      'patch: keybindingCustomization: failed to find keybinding customization gate pattern'
+    );
+    return null;
+  }
+
+  const insertIndex = match.index + match[0].indexOf('{') + 1;
+  const insertion = 'return !0;';
+
+  const newFile =
+    oldFile.slice(0, insertIndex) + insertion + oldFile.slice(insertIndex);
+
+  showDiff(oldFile, newFile, insertion, insertIndex, insertIndex);
+
+  return newFile;
+};