feat(orchestrator): MS23-P1-005 Mission Control proxy API (#722)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/orchestrator/src/api/agents/agent-provider.registry.ts

@@ -26,6 +26,28 @@ export class AgentProviderRegistry implements OnModuleInit {
     return this.providers.get(providerId) ?? null;
   }
 
+  async getProviderForSession(
+    sessionId: string
+  ): Promise<{ provider: IAgentProvider; session: AgentSession } | null> {
+    for (const provider of this.providers.values()) {
+      try {
+        const session = await provider.getSession(sessionId);
+        if (session !== null) {
+          return {
+            provider,
+            session,
+          };
+        }
+      } catch (error) {
+        this.logger.warn(
+          `Failed to get session ${sessionId} for provider ${provider.providerId}: ${this.toErrorMessage(error)}`
+        );
+      }
+    }
+
+    return null;
+  }
+
   async listAllSessions(): Promise<AgentSession[]> {
     const providers = [...this.providers.values()];
     const sessionsByProvider = await Promise.all(