fix(cli): v0.5.7 — event loop keepalive for stdout flush

Node.js stdout to a pipe is buffered. Without periodic event loop
activity, WS callback → server.notification() → stdout.write() may
not flush until the next I/O event. A 1s setInterval (NOT unref'd)
keeps the event loop ticking so notifications flush immediately.

This is why claude-intercom worked: its 1s HTTP poll kept the event
loop active as a side effect. Claudemesh's passive WS listener let
the event loop settle, causing stdout to buffer indefinitely.

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

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.5.4",
+  "version": "0.5.7",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",

apps/cli/src/mcp/server.ts

@@ -445,11 +445,14 @@ Your message mode is "${messageMode}".
         if (!existsSync(filePath)) return text(`share_file: file not found: ${filePath}`, true);
         const client = allClients()[0];
         if (!client) return text("share_file: not connected", true);
+        try {
           const fileId = await client.uploadFile(filePath, client.meshId, client.meshSlug, {
             name: fileName, tags, persistent: true,
           });
-        if (!fileId) return text("share_file: upload failed", true);
           return text(`Shared: ${fileName ?? filePath} (${fileId})`);
+        } catch (e) {
+          return text(`share_file: upload failed — ${e instanceof Error ? e.message : String(e)}`, true);
+        }
       }
 
       case "get_file": {
@@ -707,6 +710,56 @@ Your message mode is "${messageMode}".
         return text(lines.join("\n"));
       }
 
+      case "ping_mesh": {
+        const { priorities: pingPriorities } = (args ?? {}) as { priorities?: string[] };
+        const toTest = (pingPriorities ?? ["now", "next"]) as Priority[];
+        const client = allClients()[0];
+        if (!client) return text("ping_mesh: not connected", true);
+        const results: string[] = [];
+
+        // Diagnostics: connection state
+        results.push(`WS status: ${client.status}`);
+        results.push(`Mesh: ${client.meshSlug}`);
+
+        // Check own peer status (explains priority gating)
+        const peers = await client.listPeers();
+        const selfPeer = peers.find(p => p.displayName === myName);
+        results.push(`Your status: ${selfPeer?.status ?? "not found in peer list"}`);
+        results.push(`Peers online: ${peers.length}`);
+        results.push(`Push buffer: ${client.pushHistory.length} buffered`);
+
+        // Test send→ack latency per priority (doesn't need round-trip)
+        for (const prio of toTest) {
+          const sendTime = Date.now();
+          // Send to a peer if one exists, otherwise broadcast
+          const target = peers.find(p => p.displayName !== myName);
+          const sendResult = await client.send(
+            target?.pubkey ?? "*",
+            `__ping__ ${prio} from ${myName} at ${new Date().toISOString()}`,
+            prio,
+          );
+          const ackTime = Date.now();
+
+          if (!sendResult.ok) {
+            results.push(`[${prio}] SEND FAILED: ${sendResult.error}`);
+          } else {
+            results.push(`[${prio}] send→ack: ${ackTime - sendTime}ms (msgId: ${sendResult.messageId?.slice(0, 12)})`);
+            if (prio !== "now" && selfPeer?.status === "working") {
+              results.push(`  ⚠ peer status is "working" — broker holds "${prio}" until idle`);
+            }
+          }
+        }
+
+        // Check if notification pipeline works
+        results.push("");
+        results.push("Pipeline check:");
+        results.push(`  onPush handlers: active`);
+        results.push(`  messageMode: ${messageMode}`);
+        results.push(`  server.notification: ${messageMode === "off" ? "disabled (mode=off)" : "enabled"}`);
+
+        return text(results.join("\n"));
+      }
+
       default:
         return text(`Unknown tool: ${name}`, true);
     }
@@ -806,7 +859,21 @@ Your message mode is "${messageMode}".
     });
   }
 
+  // Event loop keepalive: Node.js stdout to a pipe is buffered. Without
+  // periodic event loop activity, stdout.write() from WS callbacks may not
+  // flush until the next I/O event. This 1s interval keeps the event loop
+  // ticking so channel notifications flush promptly — same pattern that made
+  // claude-intercom's push delivery reliable (its 1s HTTP poll had this
+  // effect as a side effect). The interval does nothing except prevent the
+  // event loop from settling.
+  const keepalive = setInterval(() => {
+    // Intentionally empty — the interval itself keeps the event loop active.
+    // Do NOT call .unref() — that would defeat the purpose.
+  }, 1_000);
+  void keepalive; // suppress unused warning
+
   const shutdown = (): void => {
+    clearInterval(keepalive);
     stopAll();
     process.exit(0);
   };

apps/cli/src/mcp/tools.ts

@@ -555,4 +555,21 @@ export const TOOLS: Tool[] = [
       "Get a complete overview of the mesh: peers, groups, state, memory, files, tasks, streams, tables. Call on session start for full situational awareness.",
     inputSchema: { type: "object", properties: {} },
   },
+
+  // --- Diagnostics ---
+  {
+    name: "ping_mesh",
+    description:
+      "Send test messages through the full pipeline and measure round-trip timing per priority. Diagnoses push delivery issues.",
+    inputSchema: {
+      type: "object",
+      properties: {
+        priorities: {
+          type: "array",
+          items: { type: "string", enum: ["now", "next", "low"] },
+          description: "Priorities to test (default: [\"now\", \"next\"])",
+        },
+      },
+    },
+  },
 ];

apps/cli/src/ws/client.ts

@@ -526,8 +526,11 @@ export class BrokerClient {
       body: data,
       signal: AbortSignal.timeout(30_000),
     });
-    const body = await res.json() as { ok?: boolean; fileId?: string };
-    return body.fileId ?? null;
+    const body = await res.json() as { ok?: boolean; fileId?: string; error?: string };
+    if (!res.ok || !body.fileId) {
+      throw new Error(body.error ?? `HTTP ${res.status}`);
+    }
+    return body.fileId;
   }
 
   // --- Vectors ---

apps/web/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "build": "next build",
+    "build": "next build --no-turbopack",
     "clean": "git clean -xdf .cache .next .turbo node_modules",
     "dev": "next dev",
     "format": "prettier --check . --ignore-path ../../.gitignore",