feat(#93): implement agent spawn via federation

Implements FED-010: Agent Spawn via Federation feature that enables
spawning and managing Claude agents on remote federated Mosaic Stack
instances via COMMAND message type.

Features:
- Federation agent command types (spawn, status, kill)
- FederationAgentService for handling agent operations
- Integration with orchestrator's agent spawner/lifecycle services
- API endpoints for spawning, querying status, and killing agents
- Full command routing through federation COMMAND infrastructure
- Comprehensive test coverage (12/12 tests passing)

Architecture:
- Hub → Spoke: Spawn agents on remote instances
- Command flow: FederationController → FederationAgentService →
  CommandService → Remote Orchestrator
- Response handling: Remote orchestrator returns agent status/results
- Security: Connection validation, signature verification

Files created:
- apps/api/src/federation/types/federation-agent.types.ts
- apps/api/src/federation/federation-agent.service.ts
- apps/api/src/federation/federation-agent.service.spec.ts

Files modified:
- apps/api/src/federation/command.service.ts (agent command routing)
- apps/api/src/federation/federation.controller.ts (agent endpoints)
- apps/api/src/federation/federation.module.ts (service registration)
- apps/orchestrator/src/api/agents/agents.controller.ts (status endpoint)
- apps/orchestrator/src/api/agents/agents.module.ts (lifecycle integration)

Testing:
- 12/12 tests passing for FederationAgentService
- All command service tests passing
- TypeScript compilation successful
- Linting passed

Refs #93

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/api/src/ollama/ollama.controller.spec.ts

@@ -48,11 +48,7 @@ describe("OllamaController", () => {
       });
 
       expect(result).toEqual(mockResponse);
-      expect(mockOllamaService.generate).toHaveBeenCalledWith(
-        "Hello",
-        undefined,
-        undefined
-      );
+      expect(mockOllamaService.generate).toHaveBeenCalledWith("Hello", undefined, undefined);
     });
 
     it("should generate with options and custom model", async () => {
@@ -84,9 +80,7 @@ describe("OllamaController", () => {
 
   describe("chat", () => {
     it("should complete chat conversation", async () => {
-      const messages: ChatMessage[] = [
-        { role: "user", content: "Hello!" },
-      ];
+      const messages: ChatMessage[] = [{ role: "user", content: "Hello!" }];
 
       const mockResponse = {
         model: "llama3.2",
@@ -104,11 +98,7 @@ describe("OllamaController", () => {
       });
 
       expect(result).toEqual(mockResponse);
-      expect(mockOllamaService.chat).toHaveBeenCalledWith(
-        messages,
-        undefined,
-        undefined
-      );
+      expect(mockOllamaService.chat).toHaveBeenCalledWith(messages, undefined, undefined);
     });
 
     it("should chat with options and custom model", async () => {
@@ -158,10 +148,7 @@ describe("OllamaController", () => {
       });
 
       expect(result).toEqual(mockResponse);
-      expect(mockOllamaService.embed).toHaveBeenCalledWith(
-        "Sample text",
-        undefined
-      );
+      expect(mockOllamaService.embed).toHaveBeenCalledWith("Sample text", undefined);
     });
 
     it("should embed with custom model", async () => {
@@ -177,10 +164,7 @@ describe("OllamaController", () => {
       });
 
       expect(result).toEqual(mockResponse);
-      expect(mockOllamaService.embed).toHaveBeenCalledWith(
-        "Test",
-        "nomic-embed-text"
-      );
+      expect(mockOllamaService.embed).toHaveBeenCalledWith("Test", "nomic-embed-text");
     });
   });