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>

container/agent-runner/src/providers/claude.ts

@@ -212,6 +212,10 @@ export class ClaudeProvider implements AgentProvider {
           yield { type: 'error', message: 'API retry', retryable: true };
         } else if (message.type === 'system' && (message as { subtype?: string }).subtype === 'rate_limit_event') {
           yield { type: 'error', message: 'Rate limit', retryable: false, classification: 'quota' };
+        } else if (message.type === 'system' && (message as { subtype?: string }).subtype === 'compact_boundary') {
+          const meta = (message as { compact_metadata?: { pre_tokens?: number } }).compact_metadata;
+          const detail = meta?.pre_tokens ? ` (${meta.pre_tokens.toLocaleString()} tokens compacted)` : '';
+          yield { type: 'result', text: `Context compacted${detail}.` };
         } else if (message.type === 'system' && (message as { subtype?: string }).subtype === 'task_notification') {
           const tn = message as { summary?: string };
           yield { type: 'progress', message: tn.summary || 'Task notification' };