refactor: remove dead code and narrow internal exports (knip sweep)

Knip-driven cleanup. All changes verified with tsc --noEmit, lint, and
build.

Removed (zero consumers):
- VERIFICATION_PROMPT constant + its barrel re-export
- createInitialOrchestratorPersistState factory
- transcriptWatcher singleton export
- createAnsiPatternFull / createAnsiPatternSimple factories
- TimerInfo interface + unused AiCheckResult/AiPlanCheckResult imports
  in respawn-controller.ts
- 35 unused Zod z.infer \`*Input\` types in schemas.ts
- Dead re-exports: SessionMode from session.ts, AuthSessionRecord from
  web/ports/index.ts, EnhancedPlanTask/CheckpointReview from
  ralph-tracker.ts, 7 unused entries in utils/index.ts
- 14 event/config interfaces that lived only as JSDoc hints (no TS type
  position usage): Session/Respawn/RalphLoop/RalphTracker/
  SessionManager/SessionAutoOps/Subagent/TaskQueue/TaskTracker/
  TranscriptWatcher/Image/OrchestratorLoop Events + RespawnPreset +
  SessionOutput

Narrowed to module scope (kept but no longer exported):
- buildPermissionArgs in session-cli-builder.ts
- 28 type/interface declarations used only within their own file:
  Ai{Idle,Plan}Check{Config,State}, BashToolParser{Events,Config},
  FileStream/CreateStream{Options,Result}, PlanSubagentEvent,
  SubagentCallback, RalphLoopConfig, RalphLoop{Events,Options},
  ActiveTimerInfo, DetectionStatus, ActionLogEntry, AutoOpsCallbacks,
  TunnelStatus, Timer/LRUMap/StaleExpirationMap Options, AuthState,
  SessionListenerDeps, SseStreamManagerDeps, and 8 more

Docs: CLAUDE.md advice for global-regex `lastIndex` now points to the
remaining `execPattern()` helper instead of the deleted factories.

Knip delta: unused files 42→0, unused exports 161→16, unused types 92→0.
The 16 remaining exports are a mobile-test helper toolkit intentionally
kept for upcoming tests.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/utils/cleanup-manager.ts

@@ -14,7 +14,7 @@ import type { Disposable, CleanupRegistration, CleanupResourceType } from '../ty
 /**
  * Options for setTimeout/setInterval with automatic cleanup.
  */
-export interface TimerOptions {
+interface TimerOptions {
   /** Human-readable description for debugging */
   description?: string;
 }

src/utils/index.ts

@@ -7,17 +7,14 @@
  */
 
 export { BufferAccumulator } from './buffer-accumulator.js';
-export { LRUMap, type LRUMapOptions } from './lru-map.js';
-export { CleanupManager, type TimerOptions } from './cleanup-manager.js';
+export { CleanupManager } from './cleanup-manager.js';
 export { Debouncer, KeyedDebouncer } from './debouncer.js';
-export { StaleExpirationMap, type StaleExpirationMapOptions } from './stale-expiration-map.js';
+export { StaleExpirationMap } from './stale-expiration-map.js';
 export {
   ANSI_ESCAPE_PATTERN_FULL,
   ANSI_ESCAPE_PATTERN_SIMPLE,
   TOKEN_PATTERN,
   SPINNER_PATTERN,
-  createAnsiPatternFull,
-  createAnsiPatternSimple,
   stripAnsi,
   SAFE_PATH_PATTERN,
   execPattern,
@@ -27,4 +24,4 @@ export { stringSimilarity, fuzzyPhraseMatch, todoContentHash } from './string-si
 export { assertNever } from './type-safety.js';
 export { wrapWithNice } from './nice-wrapper.js';
 export { findClaudeDir, getAugmentedPath } from './claude-cli-resolver.js';
-export { resolveOpenCodeDir, isOpenCodeAvailable } from './opencode-cli-resolver.js';
+export { resolveOpenCodeDir } from './opencode-cli-resolver.js';

src/utils/lru-map.ts

@@ -10,7 +10,7 @@
 /**
  * Configuration options for LRUMap.
  */
-export interface LRUMapOptions<K, V> {
+interface LRUMapOptions<K, V> {
   /** Maximum number of entries before eviction */
   maxSize: number;
   /** Optional callback when an entry is evicted */

src/utils/regex-patterns.ts

@@ -40,24 +40,6 @@ export const ANSI_ESCAPE_PATTERN_SIMPLE = /\x1b\[[0-9;]*[A-Za-z]/g;
  */
 export const TOKEN_PATTERN = /(\d+(?:\.\d+)?)\s*([kKmM])?\s*tokens/;
 
-/**
- * Creates a fresh copy of ANSI_ESCAPE_PATTERN_FULL.
- * Use when you need a pattern without shared lastIndex state.
- */
-export function createAnsiPatternFull(): RegExp {
-  // eslint-disable-next-line no-control-regex
-  return /\x1b(?:\[[0-9;?]*[A-Za-z]|\][^\x07\x1b]*(?:\x07|\x1b\\)|[=>])/g;
-}
-
-/**
- * Creates a fresh copy of ANSI_ESCAPE_PATTERN_SIMPLE.
- * Use when you need a pattern without shared lastIndex state.
- */
-export function createAnsiPatternSimple(): RegExp {
-  // eslint-disable-next-line no-control-regex
-  return /\x1b\[[0-9;]*[A-Za-z]/g;
-}
-
 /**
  * Strips ANSI escape codes from text using the comprehensive pattern.
  * @param text - Text containing ANSI escape codes

src/utils/stale-expiration-map.ts

@@ -22,7 +22,7 @@ interface TimedEntry<V> {
 /**
  * Configuration options for StaleExpirationMap.
  */
-export interface StaleExpirationMapOptions<K, V> {
+interface StaleExpirationMapOptions<K, V> {
   /** Time-to-live in milliseconds before entries expire */
   ttlMs: number;
   /** How often to run cleanup (default: ttlMs / 2) */