v2: SQLite state adapter, admin commands, compact feedback

- Replace in-memory Chat SDK state with SqliteStateAdapter — thread
  subscriptions now persist across restarts
- Add migration 002 for chat_sdk_kv, subscriptions, locks, lists tables
- Handle /clear in agent-runner (reset sessionId) — SDK has
  supportsNonInteractive:false for this command
- Pass /compact, /context, /cost, /files through to SDK as admin commands
- Skip admin commands in follow-up poll so they start fresh queries
- Emit compact_boundary events as user-visible feedback messages
- Pass NANOCLAW_ADMIN_USER_ID and NANOCLAW_ASSISTANT_NAME to containers

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/db/db-v2.test.ts

@@ -62,7 +62,7 @@ describe('migrations', () => {
     const db = initTestDb();
     runMigrations(db);
     const row = db.prepare('SELECT MAX(version) as v FROM schema_version').get() as { v: number };
-    expect(row.v).toBe(1);
+    expect(row.v).toBe(2);
   });
 });
 

src/db/migrations/002-chat-sdk-state.ts

@@ -0,0 +1,36 @@
+import type Database from 'better-sqlite3';
+
+import type { Migration } from './index.js';
+
+export const migration002: Migration = {
+  version: 2,
+  name: 'chat-sdk-state',
+  up(db: Database.Database) {
+    db.exec(`
+      CREATE TABLE chat_sdk_kv (
+        key TEXT PRIMARY KEY,
+        value TEXT NOT NULL,
+        expires_at INTEGER
+      );
+
+      CREATE TABLE chat_sdk_subscriptions (
+        thread_id TEXT PRIMARY KEY,
+        subscribed_at TEXT NOT NULL DEFAULT (datetime('now'))
+      );
+
+      CREATE TABLE chat_sdk_locks (
+        thread_id TEXT PRIMARY KEY,
+        token TEXT NOT NULL,
+        expires_at INTEGER NOT NULL
+      );
+
+      CREATE TABLE chat_sdk_lists (
+        key TEXT NOT NULL,
+        idx INTEGER NOT NULL,
+        value TEXT NOT NULL,
+        expires_at INTEGER,
+        PRIMARY KEY (key, idx)
+      );
+    `);
+  },
+};

src/db/migrations/index.ts

@@ -2,6 +2,7 @@ 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';
 
 export interface Migration {
   version: number;
@@ -9,7 +10,7 @@ export interface Migration {
   up: (db: Database.Database) => void;
 }
 
-const migrations: Migration[] = [migration001];
+const migrations: Migration[] = [migration001, migration002];
 
 export function runMigrations(db: Database.Database): void {
   db.exec(`