v2: make v2 the main entry point, move v1 to src/v1/

- Move all v1 files (index, router, container-runner, db, ipc, types,
  logger, channels/registry, and all utilities) to src/v1/ as a
  fully self-contained archive with no shared dependencies
- Rename v2 files to remove -v2 suffix (index-v2.ts → index.ts, etc.)
- Update all imports across v2 source, tests, and setup files
- Migrate shared utilities (config, env, container-runtime, mount-security,
  timezone, group-folder) from pino logger to v2 log module
- Migrate setup/ files from logger to log with argument order swap
- Container agent-runner: move v1 entry to v1/, rename v2 to index.ts
- Update setup skill to offer all 13 v2 channels
- Install all Chat SDK adapter packages
- dist/index.js now runs v2; dist/v1/index.js runs v1

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

src/channels/linear.ts

@@ -0,0 +1,22 @@
+/**
+ * Linear channel adapter (v2) — uses Chat SDK bridge.
+ * Issue comment threads as conversations.
+ * Self-registers on import.
+ */
+import { createLinearAdapter } from '@chat-adapter/linear';
+
+import { readEnvFile } from '../env.js';
+import { createChatSdkBridge } from './chat-sdk-bridge.js';
+import { registerChannelAdapter } from './channel-registry.js';
+
+registerChannelAdapter('linear', {
+  factory: () => {
+    const env = readEnvFile(['LINEAR_API_KEY', 'LINEAR_WEBHOOK_SECRET']);
+    if (!env.LINEAR_API_KEY) return null;
+    const linearAdapter = createLinearAdapter({
+      apiKey: env.LINEAR_API_KEY,
+      webhookSecret: env.LINEAR_WEBHOOK_SECRET,
+    });
+    return createChatSdkBridge({ adapter: linearAdapter, concurrency: 'queue' });
+  },
+});