plex, redis: module runtime containers + declare self-consumed events (ADR 0052/0046)

plex gains a broker-bound tools/events runtime container (mesh-runtime-plex)
alongside its server, and a never-throwing plex_reachable health probe. redis and
postgres subscribe to their own lifecycle events in index.ts but declared no
consumes — so the substrate never made the queue the runtime binds and it crashed
on start (404). Declare the consume, as ADR 0046 requires. Proven end-to-end in the
mesh-lab: assigned-plex and assigned-redis both green.

Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF

modules/plex/client.ts

@@ -128,4 +128,18 @@ export class PlexClient {
   async refreshAll(): Promise<void> {
     for (const library of await this.getLibraries()) await this.refreshLibrary(library.key);
   }
+
+  /**
+   * A health probe that never throws: report whether the Plex server this client is pointed at
+   * answers, and identify it when it does. Every other call assumes the server is up; this is the
+   * one that tells the mesh whether it is, so a diagnosis does not start from a stack trace.
+   */
+  async reachable(): Promise<{ reachable: boolean; url: string; server?: { name: string; version: string }; error?: string }> {
+    try {
+      const info = await this.getServerInfo();
+      return { reachable: true, url: this.baseUrl, server: { name: info.name, version: info.version } };
+    } catch (err) {
+      return { reachable: false, url: this.baseUrl, error: err instanceof Error ? err.message : String(err) };
+    }
+  }
 }