feat(daemon): multi-mesh — attach to all joined meshes simultaneously

The 1.26.0 step that finally delivers ambient mode for multi-mesh
users. Daemon holds Map<slug, DaemonBrokerClient>; one process, one
PID per user, all your meshes online concurrently.

run.ts: claudemesh daemon up with no --mesh attaches to every joined
mesh from config. --mesh <slug> still scopes to one (legacy mode).
The daemon_started log line reports meshes: [...] instead of mesh.

drain.ts: dispatches each outbox row to the broker keyed by row.mesh
(column added in 1.25.0). Legacy rows with mesh=NULL fall back to the
only broker if there's exactly one, otherwise mark dead with a clear
error.

ipc/server.ts:
- GET /v1/peers aggregates across all attached meshes; each peer
  record gains a mesh field. ?mesh=<slug> narrows server-side.
- GET /v1/skills aggregates similarly; /v1/skills/:name walks meshes
  and returns first match.
- POST /v1/send requires mesh field on multi-mesh daemons; auto-picks
  on single-mesh; returns 400 with attached list if ambiguous.
- POST /v1/profile accepts optional mesh; without it, fans out to all
  attached meshes (consistent presence).

CLI: trySendViaDaemon now forwards expectedMesh as the body's mesh
field (was informational, now authoritative). claudemesh send
--mesh A and --mesh B from the same shell both route to the right
broker via the same daemon process.

Verified: aggregated peer list across 3 attached meshes; cross-mesh
sends from CLI reach status=done with correct broker_message_ids.

Released as 1.26.0 on npm.

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

apps/cli/src/services/bridge/daemon-route.ts

@@ -90,6 +90,11 @@ export async function trySendViaDaemon(args: {
         message: args.message,
         priority: args.priority,
         ...(args.idempotencyKey ? { client_message_id: args.idempotencyKey } : {}),
+        // v1.26.0 multi-mesh: forward the caller's chosen mesh so the
+        // daemon picks the right broker. Omitting it on a single-mesh
+        // daemon still works (auto-pick); omitting it on a multi-mesh
+        // daemon returns 400 with the attached list.
+        ...(args.expectedMesh ? { mesh: args.expectedMesh } : {}),
       },
     });