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/skills/agent-browser.md

@@ -1,6 +1,6 @@
 ---
 name: agent-browser
-description: Automates browser interactions for web testing, form filling, screenshots, and data extraction. Use when the user needs to navigate websites, interact with web pages, fill forms, take screenshots, test web applications, or extract information from web pages.
+description: Browse the web for any task — research topics, read articles, interact with web apps, fill forms, take screenshots, extract data, and test web pages. Use whenever a browser would be useful, not just when the user explicitly asks.
 allowed-tools: Bash(agent-browser:*)
 ---