chore: remove backend code nothing references

Found with knip (exports, types, class members) and confirmed by a text
search of src, test, scripts and packages before each removal.

- Per-CLI get<Cli>NotFoundMessage() (nine of them) with their message
  constants: missingCliMessage() builds that text from the registry now.
- Registry leftovers: renderCliCommand, asCliId, cliIds, isCliRunnable,
  createCliResolverForTest, profileExists, and two name lists that only
  repeated schema enums.
- A task-description cache in Session that was written on every chunk of
  terminal output (one regex pass per line) and never read since the
  subagent watcher takes descriptions from transcripts. The cache module,
  its pattern and both parse methods go with it.
- Session.parentAgentId / childAgentIds: never set by anything, so the two
  optional SessionState fields were never on the wire.
- Unreferenced methods on TmuxManager (pipe-pane pair, syncMouseMode),
  RespawnController, StateStore.recoverFromBackup (load() already falls
  back to the .bak file), TeamWatcher, SseStreamManager and the AI
  checkers' getErrorVerdict.
- updateCaseEnvVars: the settings.local.json env path that envOverrides
  replaced.
- Re-exports in the utils, cli-registry, routes and prompts barrels that
  no importer used, and unused test helpers (MockStateStore, the mobile
  throttle helpers and others).

Eight mobile tests imported the WebServer type from a path that does not
exist (../src instead of ../../src); type-only, so nothing failed.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

test/mobile/accessibility.test.ts

@@ -10,7 +10,7 @@ import {
   assertZoomNotDisabled, getCSSProperty,
 } from './helpers/assertions.js';
 import { REPRESENTATIVE_DEVICES } from './devices.js';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 
 let baseUrl: string;
 

test/mobile/device-matrix.test.ts

@@ -1,7 +1,7 @@
 // Ephemeral port - Cross-device parametric tests
 import { describe, it, expect, beforeAll, afterAll } from 'vitest';
 import type { BrowserContext, Page } from 'playwright';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 import { createTestServer, stopTestServer } from './helpers/server.js';
 import { createDevicePage, closeAllBrowsers } from './helpers/browser.js';
 import { SELECTORS, BREAKPOINTS, BODY_CLASSES } from './helpers/constants.js';

test/mobile/devices.ts

@@ -321,13 +321,6 @@ export const SMALL_TABLETS: DeviceEntry[] = DEVICE_REGISTRY.filter((d) => d.cate
 export const STANDARD_TABLETS: DeviceEntry[] = DEVICE_REGISTRY.filter((d) => d.category === 'standard-tablet');
 export const LARGE_TABLETS: DeviceEntry[] = DEVICE_REGISTRY.filter((d) => d.category === 'large-tablet');
 
-// ---------------------------------------------------------------------------
-// Platform exports
-// ---------------------------------------------------------------------------
-
-export const IOS_DEVICES: DeviceEntry[] = DEVICE_REGISTRY.filter((d) => d.isIOS);
-export const ANDROID_DEVICES: DeviceEntry[] = DEVICE_REGISTRY.filter((d) => !d.isIOS);
-
 // ---------------------------------------------------------------------------
 // Representative devices — one per category for quick smoke tests
 // ---------------------------------------------------------------------------

test/mobile/helpers/assertions.ts

@@ -156,21 +156,6 @@ export async function assertNotHasClass(page: Page, selector: string, className:
   expect(has).toBe(false);
 }
 
-/** Assert element's computed transform includes a translateY value */
-export async function assertTranslateY(
-  page: Page,
-  selector: string,
-  expectedY: number,
-  tolerance: number = 2,
-): Promise<void> {
-  const transform = await getCSSProperty(page, selector, 'transform');
-  // transform is a matrix(...) string; extract translateY
-  // matrix(a, b, c, d, tx, ty) — ty is the 6th value
-  const match = transform.match(/matrix\([^,]+,[^,]+,[^,]+,[^,]+,[^,]+,\s*([^)]+)\)/);
-  const ty = match ? parseFloat(match[1]) : 0;
-  expect(Math.abs(ty - expectedY)).toBeLessThanOrEqual(tolerance);
-}
-
 /** Check viewport meta tag doesn't disable zoom */
 export async function assertZoomNotDisabled(page: Page): Promise<void> {
   const meta = await page.evaluate(() => {

test/mobile/helpers/browser.ts

@@ -60,6 +60,3 @@ export async function closeAllBrowsers(): Promise<void> {
   }
 }
 
-export function isChromium(engine: 'chromium' | 'webkit'): boolean {
-  return engine === 'chromium';
-}

test/mobile/helpers/cdp.ts

@@ -39,38 +39,3 @@ export async function dispatchTouchEvent(
   });
 }
 
-/** Throttle CPU to simulate mobile hardware (rate = slowdown factor, e.g. 4 = 4x slower) */
-export async function setCPUThrottle(cdp: CDPSession, rate: number): Promise<void> {
-  await cdp.send('Emulation.setCPUThrottlingRate', { rate });
-}
-
-/** Clear CPU throttling */
-export async function clearCPUThrottle(cdp: CDPSession): Promise<void> {
-  await cdp.send('Emulation.setCPUThrottlingRate', { rate: 1 });
-}
-
-/** Emulate network conditions */
-export async function setNetworkThrottle(
-  cdp: CDPSession,
-  downloadKbps: number,
-  uploadKbps: number,
-  latencyMs: number,
-): Promise<void> {
-  await cdp.send('Network.enable');
-  await cdp.send('Network.emulateNetworkConditions', {
-    offline: false,
-    downloadThroughput: (downloadKbps * 1024) / 8,
-    uploadThroughput: (uploadKbps * 1024) / 8,
-    latency: latencyMs,
-  });
-}
-
-/** Clear network throttling */
-export async function clearNetworkThrottle(cdp: CDPSession): Promise<void> {
-  await cdp.send('Network.emulateNetworkConditions', {
-    offline: false,
-    downloadThroughput: -1,
-    uploadThroughput: -1,
-    latency: 0,
-  });
-}

test/mobile/helpers/server.ts

@@ -1,23 +1,13 @@
 import { WebServer } from '../../../src/web/server.js';
 
-const servers = new Set<WebServer>();
-
 /** A test server on an ephemeral port; read the port from `server.boundPort` once this resolves. */
 export async function createTestServer(): Promise<WebServer> {
   const server = new WebServer(0, false, true); // testMode = true
   await server.start();
-  servers.add(server);
   return server;
 }
 
 export async function stopTestServer(server: WebServer): Promise<void> {
   await server.stop();
-  servers.delete(server);
 }
 
-export async function stopAllTestServers(): Promise<void> {
-  for (const server of servers) {
-    await server.stop();
-  }
-  servers.clear();
-}

test/mobile/helpers/touch-sim.ts

@@ -243,19 +243,3 @@ export async function tapViaSynthetic(page: Page, selector: string): Promise<voi
   }, selector);
 }
 
-/** Tap using the best available method */
-export async function tap(
-  page: Page,
-  selector: string,
-  options: { isChromium?: boolean } = {},
-): Promise<void> {
-  if (options.isChromium !== false) {
-    try {
-      await tapViaCDP(page, selector);
-      return;
-    } catch {
-      // Fall through
-    }
-  }
-  await tapViaSynthetic(page, selector);
-}

test/mobile/keyboard.test.ts

@@ -24,7 +24,7 @@ import {
   getCSSProperty,
 } from './helpers/assertions.js';
 import { REPRESENTATIVE_DEVICES } from './devices.js';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 
 let baseUrl: string;
 

test/mobile/layout.test.ts

@@ -1,7 +1,7 @@
 // Ephemeral port - General mobile layout tests
 import { describe, it, expect, beforeAll, afterAll } from 'vitest';
 import type { BrowserContext, Page } from 'playwright';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 import { createTestServer, stopTestServer } from './helpers/server.js';
 import { createDevicePage, closeAllBrowsers } from './helpers/browser.js';
 import { SELECTORS, BREAKPOINTS, BODY_CLASSES, WAIT, MIN_TOUCH_TARGET } from './helpers/constants.js';

test/mobile/settings.test.ts

@@ -7,7 +7,7 @@ import { createDevicePage, closeAllBrowsers } from './helpers/browser.js';
 import { showKeyboard, hideKeyboard } from './helpers/keyboard-sim.js';
 import { assertVisible, assertHidden, getCSSProperty, getCSSNumericValue } from './helpers/assertions.js';
 import { DEVICE_REGISTRY, REPRESENTATIVE_DEVICES } from './devices.js';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 
 let baseUrl: string;
 

test/mobile/subagent-windows.test.ts

@@ -7,7 +7,7 @@ import { createDevicePage, closeAllBrowsers } from './helpers/browser.js';
 import { showKeyboard, hideKeyboard } from './helpers/keyboard-sim.js';
 import { getCSSProperty, getCSSNumericValue } from './helpers/assertions.js';
 import { REPRESENTATIVE_DEVICES } from './devices.js';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 
 let baseUrl: string;
 

test/mobile/tabs.test.ts

@@ -7,7 +7,7 @@ import { createDevicePage, closeAllBrowsers } from './helpers/browser.js';
 import { swipe, swipeViaCDP, swipeViaSynthetic } from './helpers/touch-sim.js';
 import { assertHidden, assertVisible, getCSSProperty, getCSSNumericValue } from './helpers/assertions.js';
 import { REPRESENTATIVE_DEVICES } from './devices.js';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 
 let baseUrl: string;
 

test/mobile/visual-regression.test.ts

@@ -1,7 +1,7 @@
 // Ephemeral port - Screenshot comparison tests
 import { describe, it, expect, beforeAll, afterAll } from 'vitest';
 import type { BrowserContext, Page } from 'playwright';
-import type { WebServer } from '../src/web/server.js';
+import type { WebServer } from '../../src/web/server.js';
 import { createTestServer, stopTestServer } from './helpers/server.js';
 import { createDevicePage, closeAllBrowsers } from './helpers/browser.js';
 import { SELECTORS, VISUAL, VISUAL_BREAKPOINTS, WAIT } from './helpers/constants.js';