chore(api): add /v1/me/ping sanity probe

confirms whether new GET routes under /me/* deploy correctly to
vercel — diagnostic in the middle of the /me/topics 404 chase.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/scheduled_tasks.lock

@@ -1 +1 @@
-{"sessionId":"ae5dbe38-9c56-4d07-9fb6-a38cb8a250a6","pid":4612,"acquiredAt":1776217467441}
+{"sessionId":"ae5dbe38-9c56-4d07-9fb6-a38cb8a250a6","pid":3633,"procStart":"Fri May  1 22:40:56 2026","acquiredAt":1777683244936}

apps/cli/src/services/api/with-rest-key.ts

@@ -45,6 +45,22 @@ export async function withRestKey<T>(
     if (!result || !result.secret) {
       throw new Error("apikey mint failed — broker did not return a secret");
     }
+    if (process.env.CLAUDEMESH_DEBUG_PROBE) {
+      const probeUrls = [
+        "https://claudemesh.com/api/v1/me/workspace",
+        "https://claudemesh.com/api/v1/me/topics",
+      ];
+      for (const u of probeUrls) {
+        const r = await fetch(u, {
+          headers: { Authorization: `Bearer ${result.secret}` },
+        });
+        const t = await r.text();
+        console.error(
+          `[probe] ${u} → ${r.status} ${r.headers.get("content-type")} (${t.slice(0, 200).replace(/\n/g, " ")})`,
+        );
+      }
+      process.exit(0);
+    }
     try {
       return await fn({
         secret: result.secret,

packages/api/src/modules/mesh/v1-router.ts

@@ -496,6 +496,13 @@ export const v1Router = new Hono<Env>()
     });
   })
 
+  // GET /v1/me/ping — sanity probe for cross-mesh route health.
+  .get("/me/ping", async (c) => {
+    const key = c.var.apiKey;
+    requireCapability(key, "read");
+    return c.json({ ok: true, hasIssuer: !!key.issuedByMemberId });
+  })
+
   // GET /v1/me/topics — cross-mesh topic list for the caller's user.
   //
   // For each topic across every mesh the user belongs to, returns