feat(cli): websocket client + MCP tool integration

broker-client: full WS client with hello handshake + ack, auto-reconnect
with exponential backoff (1s → 30s capped), in-memory outbound queue
(max 100) during reconnect, 500-entry push buffer for check_messages.

MCP tool integration:
- send_message: "slug:target" prefix or single-mesh fast path
- check_messages: drains push buffers across all clients
- set_status: fans manual override across all connected meshes
- set_summary: stubbed (broker protocol extension needed)
- list_peers: stubbed — lists connected mesh slugs + statuses

manager module holds Map<meshId, BrokerClient>, starts on MCP server
boot for every joined mesh in ~/.claudemesh/config.json.

new CLI command: seed-test-mesh injects a mesh row for dev testing.

also fixes a broker-side hello race: handleHello sent hello_ack before
the caller closure assigned presenceId, so clients sending right after
the ack hit the no_hello check. Fix: return presenceId, caller sets
closure var, THEN sends hello_ack. Queue drain is fire-and-forget now.

round-trip verified: two clients, A→B, push received with correct
senderPubkey + ciphertext. 44/44 broker tests still pass.

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

apps/cli/src/index.ts

@@ -14,6 +14,7 @@ import { runInstall } from "./commands/install";
 import { runJoin } from "./commands/join";
 import { runList } from "./commands/list";
 import { runLeave } from "./commands/leave";
+import { runSeedTestMesh } from "./commands/seed-test-mesh";
 
 const HELP = `claudemesh — peer mesh for Claude Code sessions
 
@@ -25,6 +26,7 @@ Commands:
   join <link>     Join a mesh via invite link (ic://join/...)
   list            Show all joined meshes
   leave <slug>    Leave a joined mesh
+  seed-test-mesh  Dev-only: inject a mesh into config (skips invite flow)
   mcp             Start MCP server (stdio) — invoked by Claude Code
   --help, -h      Show this help
 
@@ -54,6 +56,9 @@ async function main(): Promise<void> {
     case "leave":
       runLeave(args);
       return;
+    case "seed-test-mesh":
+      runSeedTestMesh(args);
+      return;
     case "--help":
     case "-h":
     case "help":