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/transcript-watcher.ts

@@ -20,7 +20,7 @@ import { createInterface } from 'node:readline';
 /**
  * Parsed transcript entry from the JSONL file
  */
-export interface TranscriptEntry {
+interface TranscriptEntry {
   type: 'user' | 'assistant' | 'system' | 'result';
   timestamp: string;
   message?: {
@@ -35,7 +35,7 @@ export interface TranscriptEntry {
   };
 }
 
-export interface TranscriptContentBlock {
+interface TranscriptContentBlock {
   type: 'text' | 'tool_use' | 'tool_result';
   text?: string;
   name?: string;
@@ -68,15 +68,6 @@ export interface TranscriptState {
   lastUpdateAt: string | null;
 }
 
-export interface TranscriptWatcherEvents {
-  'transcript:update': (state: TranscriptState) => void;
-  'transcript:complete': (state: TranscriptState) => void;
-  'transcript:tool_start': (toolName: string) => void;
-  'transcript:tool_end': (toolName: string, isError: boolean) => void;
-  'transcript:error': (error: Error) => void;
-  'transcript:plan_mode': () => void;
-}
-
 // ========== Constants ==========
 
 /** How often to check for new content when file watching fails */
@@ -435,7 +426,3 @@ export class TranscriptWatcher extends EventEmitter {
     }
   }
 }
-
-// ========== Singleton Export ==========
-
-export const transcriptWatcher = new TranscriptWatcher();