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>

src/index.ts

@@ -209,8 +209,8 @@ async function processGroupMessages(chatJid: string): Promise<boolean> {
 
   if (missedMessages.length === 0) return true;
 
-  // For non-main groups, check if any message has the trigger
-  if (!isMainGroup) {
+  // For non-main groups, check if trigger is required and present
+  if (!isMainGroup && group.requiresTrigger !== false) {
     const hasTrigger = missedMessages.some((m) =>
       TRIGGER_PATTERN.test(m.content.trim()),
     );