feat(cli): v0.5.1 — message modes (push/inbox/off)

--inbox: count-only notifications, no content in context
--no-messages: tools only, zero prompt injection risk
Default: push (real-time, current behavior)

Wizard shows mode picker when no flag provided.
MCP instructions tell Claude its current mode.

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

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",