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/types/orchestrator.ts

@@ -268,18 +268,3 @@ export function createInitialOrchestratorStats(): OrchestratorStats {
     replanCount: 0,
   };
 }
-
-/** Factory function for initial orchestrator persist state */
-export function createInitialOrchestratorPersistState(
-  config: OrchestratorConfig = DEFAULT_ORCHESTRATOR_CONFIG
-): OrchestratorPersistState {
-  return {
-    state: 'idle',
-    plan: null,
-    currentPhaseIndex: 0,
-    startedAt: null,
-    completedAt: null,
-    config,
-    stats: createInitialOrchestratorStats(),
-  };
-}

src/types/respawn.ts

@@ -230,22 +230,6 @@ export interface TimingHistory {
 /**
  * Named respawn configuration preset for quick setup
  */
-export interface RespawnPreset {
-  /** Unique preset identifier */
-  id: string;
-  /** User-friendly preset name */
-  name: string;
-  /** Description of when to use this preset */
-  description?: string;
-  /** The respawn configuration (without enabled flag) */
-  config: Omit<RespawnConfig, 'enabled'>;
-  /** Duration in minutes (optional default) */
-  durationMinutes?: number;
-  /** Whether this is a built-in preset */
-  builtIn?: boolean;
-  /** Timestamp when created */
-  createdAt: number;
-}
 
 /**
  * Persisted respawn configuration for mux sessions.

src/types/session.ts

@@ -150,11 +150,3 @@ export interface SessionState {
 /**
  * Output captured from a session
  */
-export interface SessionOutput {
-  /** Standard output content */
-  stdout: string;
-  /** Standard error content */
-  stderr: string;
-  /** Exit code of the process, null if still running */
-  exitCode: number | null;
-}