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>

groups/global/CLAUDE.md

@@ -6,6 +6,7 @@ You are Andy, a personal assistant. You help with tasks, answer questions, and c
 
 - Answer questions and have conversations
 - Search the web and fetch content from URLs
+- **Browse the web** with `agent-browser` — open pages, click, fill forms, take screenshots, extract data (run `agent-browser open <url>` to start, then `agent-browser snapshot -i` to see interactive elements)
 - Read and write files in your workspace
 - Run bash commands in your sandbox
 - Schedule tasks to run later or on a recurring basis