fix: setup skill reliability, requiresTrigger option, agent-browser visibility

Setup skill fixes:
- Run QR auth in foreground with long timeout, not background
- Replace fragile message-based registration with DB group sync lookup
- Personal chats: ask for phone number instead of querying empty DB
- Consolidate trigger word + security model + channel selection into one step
- Remove `timeout` shell command (unavailable on macOS), use Bash tool timeout
- Query 40 groups, display 10 at a time, support name lookup

requiresTrigger support:
- Add requiresTrigger field to RegisteredGroup type and DB schema
- Skip trigger check when requiresTrigger is false (for solo/personal chats)
- Main group still always processes all messages (unchanged)

Agent-browser visibility:
- Append global CLAUDE.md to non-main agent system prompts via SDK
- Add browser tool docs to global and main CLAUDE.md
- Update skill description to be broader (not just "web testing")
- Reference agent-browser.md in root CLAUDE.md key files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

container/agent-runner/src/index.ts

@@ -257,6 +257,13 @@ async function main(): Promise<void> {
     prompt = `[SCHEDULED TASK - The following message was sent automatically and is not coming directly from the user or group.]\n\n${input.prompt}`;
   }
 
+  // Load global CLAUDE.md as additional system context (shared across all groups)
+  const globalClaudeMdPath = '/workspace/global/CLAUDE.md';
+  let globalClaudeMd: string | undefined;
+  if (!input.isMain && fs.existsSync(globalClaudeMdPath)) {
+    globalClaudeMd = fs.readFileSync(globalClaudeMdPath, 'utf-8');
+  }
+
   try {
     log('Starting agent...');
 
@@ -265,6 +272,9 @@ async function main(): Promise<void> {
       options: {
         cwd: '/workspace/group',
         resume: input.sessionId,
+        systemPrompt: globalClaudeMd
+          ? { type: 'preset' as const, preset: 'claude_code' as const, append: globalClaudeMd }
+          : undefined,
         allowedTools: [
           'Bash',
           'Read', 'Write', 'Edit', 'Glob', 'Grep',