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/src/state/config.ts

@@ -38,6 +38,7 @@ export interface Config {
   meshes: JoinedMesh[];
   displayName?: string; // per-session override, written by `claudemesh launch --name`
   groups?: GroupEntry[];
+  messageMode?: "push" | "inbox" | "off";
 }
 
 const CONFIG_DIR = env.CLAUDEMESH_CONFIG_DIR ?? join(homedir(), ".claudemesh");
@@ -53,7 +54,7 @@ export function loadConfig(): Config {
     if (!parsed || !Array.isArray(parsed.meshes)) {
       return { version: 1, meshes: [] };
     }
-    return { version: 1, meshes: parsed.meshes, displayName: parsed.displayName, groups: parsed.groups };
+    return { version: 1, meshes: parsed.meshes, displayName: parsed.displayName, groups: parsed.groups, messageMode: parsed.messageMode };
   } catch (e) {
     throw new Error(
       `Failed to load ${CONFIG_PATH}: ${e instanceof Error ? e.message : String(e)}`,