feat: hierarchical group routing + role wiring

broker: expand member groups to ancestor paths at drain time (pull model)
- @flexicar message reaches peers in @flexicar/core, @flexicar/output, etc.
- Resolved at drainForMember — no DB changes, fully backward-compatible
- Any depth: flexicar/team/backend also matches @flexicar and @flexicar/team

cli: wire --role all the way through to session config + env
- Config.role field added
- launch.ts stores role in sessionConfig, passes CLAUDEMESH_ROLE env var
- mcp/server.ts includes role in identity string
- manager.ts auto-joins groups from config on WS connect (--groups flag now works)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/cli/src/commands/launch.ts

@@ -27,6 +27,7 @@ interface LaunchArgs {
   joinLink: string | null;
   meshSlug: string | null;
   messageMode: "push" | "inbox" | "off" | null;
+  systemPrompt: string | null;
   quiet: boolean;
   skipPermConfirm: boolean;
   claudeArgs: string[];
@@ -40,6 +41,7 @@ function parseArgs(argv: string[]): LaunchArgs {
     joinLink: null,
     meshSlug: null,
     messageMode: null,
+    systemPrompt: null,
     quiet: false,
     skipPermConfirm: false,
     claudeArgs: [],
@@ -68,6 +70,16 @@ function parseArgs(argv: string[]): LaunchArgs {
       result.meshSlug = argv[++i]!;
     } else if (arg.startsWith("--mesh=")) {
       result.meshSlug = arg.slice("--mesh=".length);
+    } else if (arg === "--message-mode" && i + 1 < argv.length) {
+      const mode = argv[++i]! as "push" | "inbox" | "off";
+      if (["push", "inbox", "off"].includes(mode)) result.messageMode = mode;
+    } else if (arg.startsWith("--message-mode=")) {
+      const mode = arg.slice("--message-mode=".length) as "push" | "inbox" | "off";
+      if (["push", "inbox", "off"].includes(mode)) result.messageMode = mode;
+    } else if (arg === "--system-prompt" && i + 1 < argv.length) {
+      result.systemPrompt = argv[++i]!;
+    } else if (arg.startsWith("--system-prompt=")) {
+      result.systemPrompt = arg.slice("--system-prompt=".length);
     } else if (arg === "--inbox") {
       result.messageMode = "inbox";
     } else if (arg === "--no-messages") {
@@ -318,6 +330,7 @@ export async function runLaunch(extraArgs: string[]): Promise<void> {
     version: 1,
     meshes: [mesh],
     displayName,
+    ...(role ? { role } : {}),
     ...(parsedGroups.length > 0 ? { groups: parsedGroups } : {}),
     messageMode,
   };
@@ -351,6 +364,7 @@ export async function runLaunch(extraArgs: string[]): Promise<void> {
     "--dangerously-load-development-channels",
     "server:claudemesh",
     "--dangerously-skip-permissions",
+    ...(args.systemPrompt ? ["--system-prompt", args.systemPrompt] : []),
     ...filtered,
   ];
 
@@ -362,6 +376,7 @@ export async function runLaunch(extraArgs: string[]): Promise<void> {
       ...process.env,
       CLAUDEMESH_CONFIG_DIR: tmpDir,
       CLAUDEMESH_DISPLAY_NAME: displayName,
+      ...(role ? { CLAUDEMESH_ROLE: role } : {}),
     },
   });
 

apps/cli/src/mcp/server.ts

@@ -130,6 +130,7 @@ export async function startMcpServer(): Promise<void> {
   const config = loadConfig();
 
   const myName = config.displayName ?? "unnamed";
+  const myRole = config.role ?? process.env.CLAUDEMESH_ROLE ?? null;
   const myGroups = (config.groups ?? []).map(g => `@${g.name}${g.role ? ':' + g.role : ''}`).join(', ') || "none";
   const messageMode = config.messageMode ?? "push";
 
@@ -141,7 +142,7 @@ export async function startMcpServer(): Promise<void> {
         tools: {},
       },
       instructions: `## Identity
-You are "${myName}" — a peer in the claudemesh network. Your groups: ${myGroups}. You are one of several Claude Code sessions connected to the same mesh. No orchestrator exists — peers are equals. Your identity comes from your name and group roles, not from a central authority.
+You are "${myName}"${myRole ? ` (${myRole})` : ""} — a peer in the claudemesh network. Your groups: ${myGroups}. You are one of several Claude Code sessions connected to the same mesh. No orchestrator exists — peers are equals. Your identity comes from your name and group roles, not from a central authority.
 
 ## Responding to messages
 When you receive a <channel source="claudemesh" ...> message, RESPOND IMMEDIATELY. Pause your current task, reply via send_message, then resume. Read from_name, mesh_slug, and priority from the channel attributes. Reply by setting \`to\` to the sender's from_name (display name). Stay in character per your system prompt. Do not ignore low-priority messages — acknowledge them briefly even if you defer action.

apps/cli/src/state/config.ts

@@ -37,6 +37,7 @@ export interface Config {
   version: 1;
   meshes: JoinedMesh[];
   displayName?: string; // per-session override, written by `claudemesh launch --name`
+  role?: string;        // per-session role tag (display + hello)
   groups?: GroupEntry[];
   messageMode?: "push" | "inbox" | "off";
 }
@@ -54,7 +55,7 @@ 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, messageMode: parsed.messageMode };
+    return { version: 1, meshes: parsed.meshes, displayName: parsed.displayName, role: parsed.role, groups: parsed.groups, messageMode: parsed.messageMode };
   } catch (e) {
     throw new Error(
       `Failed to load ${CONFIG_PATH}: ${e instanceof Error ? e.message : String(e)}`,

apps/cli/src/ws/manager.ts

@@ -12,6 +12,7 @@ import { env } from "../env";
 
 const clients = new Map<string, BrokerClient>();
 let configDisplayName: string | undefined;
+let configGroups: Config["groups"] = [];
 
 /** Ensure a BrokerClient exists + is connecting/open for this mesh. */
 export async function ensureClient(mesh: JoinedMesh): Promise<BrokerClient> {
@@ -21,6 +22,10 @@ export async function ensureClient(mesh: JoinedMesh): Promise<BrokerClient> {
   clients.set(mesh.meshId, client);
   try {
     await client.connect();
+    // Auto-join groups declared at launch time (--groups flag or config).
+    for (const g of configGroups ?? []) {
+      try { await client.joinGroup(g.name, g.role); } catch { /* best effort */ }
+    }
   } catch {
     // Connect failed → client is in "reconnecting" state, leave it
     // wired so tool calls can surface the status.
@@ -31,6 +36,7 @@ export async function ensureClient(mesh: JoinedMesh): Promise<BrokerClient> {
 /** Start clients for every joined mesh. Called once on MCP server start. */
 export async function startClients(config: Config): Promise<void> {
   configDisplayName = config.displayName;
+  configGroups = config.groups ?? [];
   await Promise.allSettled(config.meshes.map(ensureClient));
 }