refactor(modules): extract approvals + interactive as registry-based modules

Phase 2 / PR #3 of the module refactor. Moves the approval and interactive-
question flows out of core and into src/modules/, wired through the response
dispatcher and delivery action registries.

New modules:
- src/modules/interactive/ — registers a response handler that claims
  pending_questions rows, writes question_response to the session DB, wakes
  the container. createPendingQuestion call stays inline in delivery.ts
  (guarded by hasTable) per plan.
- src/modules/approvals/ — registers 3 delivery actions (install_packages,
  request_rebuild, add_mcp_server), a response handler for pending_approvals
  (including OneCLI action fall-through), an adapter-ready hook that boots
  the OneCLI manual-approval handler, and a shutdown hook that stops it.
  OneCLI implementation (src/onecli-approvals.ts) moves into the module.

Core lifecycle hooks added (narrow, not registries):
- onDeliveryAdapterReady(cb) in delivery.ts — fires when setDeliveryAdapter
  runs (or immediately if already set). Used by approvals for OneCLI boot.
- onShutdown(cb) in index.ts — fires on SIGTERM/SIGINT. Used by approvals
  for OneCLI teardown.
- getDeliveryAdapter() getter in delivery.ts — for live-flow adapter access
  in registered delivery actions.

Core shrinks: delivery.ts 911 → 665 lines, index.ts 405 → 224 lines.
dispatchResponse now logs "Unclaimed response" instead of falling through
to an inline handler — the inline fallback moved into the two modules.

Migration files renamed to the module-<name>-<short>.ts convention:
- 003-pending-approvals.ts → module-approvals-pending-approvals.ts
- 007-pending-approvals-title-options.ts → module-approvals-title-options.ts
Migration.name fields unchanged so existing DBs treat them as already-applied.

Degradation verified: emptying the modules barrel builds clean and 137/137
tests pass. Actions would log "Unknown system action"; button clicks would
log "Unclaimed response".

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

src/db/migrations/index.ts

@@ -3,11 +3,11 @@ import type Database from 'better-sqlite3';
 import { log } from '../../log.js';
 import { migration001 } from './001-initial.js';
 import { migration002 } from './002-chat-sdk-state.js';
-import { migration003 } from './003-pending-approvals.js';
 import { migration004 } from './004-agent-destinations.js';
-import { migration007 } from './007-pending-approvals-title-options.js';
 import { migration008 } from './008-dropped-messages.js';
 import { migration009 } from './009-drop-pending-credentials.js';
+import { moduleApprovalsPendingApprovals } from './module-approvals-pending-approvals.js';
+import { moduleApprovalsTitleOptions } from './module-approvals-title-options.js';
 
 export interface Migration {
   version: number;
@@ -18,9 +18,9 @@ export interface Migration {
 const migrations: Migration[] = [
   migration001,
   migration002,
-  migration003,
+  moduleApprovalsPendingApprovals,
   migration004,
-  migration007,
+  moduleApprovalsTitleOptions,
   migration008,
   migration009,
 ];