feat: v0.2.0 — Groups (@group routing, roles, wizard)

Phase A of the claudemesh spec. Peers can now join named groups
with roles, and messages route to @group targets.

Broker:
- @group routing in fan-out (matches peer group membership)
- @all alias for broadcast
- join_group/leave_group WS messages + DB persistence
- list_peers returns group metadata
- drainForMember matches @group targetSpecs in SQL

CLI:
- join_group/leave_group MCP tools
- send_message supports @group targets
- list_peers shows group membership
- PeerInfo includes groups array
- Peer name cache for push notifications

Launch:
- --role flag (optional peer role)
- --groups flag (comma-separated, e.g. "frontend:lead,reviewers")
- Interactive wizard for role + groups when flags omitted
- Groups written to session config for broker hello

Spec: SPEC.md added with full v0.2 vision (groups, state, memory)

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

apps/cli/src/state/config.ts

@@ -28,10 +28,16 @@ export interface JoinedMesh {
   joinedAt: string;
 }
 
+export interface GroupEntry {
+  name: string;
+  role?: string;
+}
+
 export interface Config {
   version: 1;
   meshes: JoinedMesh[];
   displayName?: string; // per-session override, written by `claudemesh launch --name`
+  groups?: GroupEntry[];
 }
 
 const CONFIG_DIR = env.CLAUDEMESH_CONFIG_DIR ?? join(homedir(), ".claudemesh");
@@ -47,7 +53,7 @@ export function loadConfig(): Config {
     if (!parsed || !Array.isArray(parsed.meshes)) {
       return { version: 1, meshes: [] };
     }
-    return { version: 1, meshes: parsed.meshes, displayName: parsed.displayName };
+    return { version: 1, meshes: parsed.meshes, displayName: parsed.displayName, groups: parsed.groups };
   } catch (e) {
     throw new Error(
       `Failed to load ${CONFIG_PATH}: ${e instanceof Error ? e.message : String(e)}`,