Add multi-agent config and registry runtime flow

pkg/config/validate_test.go

@@ -0,0 +1,44 @@
+package config
+
+import "testing"
+
+func TestValidateSubagentsAllowsKnownPeers(t *testing.T) {
+	t.Parallel()
+
+	cfg := DefaultConfig()
+	cfg.Agents.Router.Enabled = true
+	cfg.Agents.Router.MainAgentID = "main"
+	cfg.Agents.Subagents["main"] = SubagentConfig{
+		Enabled:    true,
+		Type:       "router",
+		AcceptFrom: []string{"user", "coder"},
+		CanTalkTo:  []string{"coder"},
+	}
+	cfg.Agents.Subagents["coder"] = SubagentConfig{
+		Enabled:    true,
+		Type:       "worker",
+		AcceptFrom: []string{"main"},
+		CanTalkTo:  []string{"main"},
+		Runtime: SubagentRuntimeConfig{
+			Proxy: "proxy",
+		},
+	}
+
+	if errs := Validate(cfg); len(errs) != 0 {
+		t.Fatalf("expected config to be valid, got %v", errs)
+	}
+}
+
+func TestValidateSubagentsRejectsUnknownPeer(t *testing.T) {
+	t.Parallel()
+
+	cfg := DefaultConfig()
+	cfg.Agents.Subagents["coder"] = SubagentConfig{
+		Enabled:    true,
+		AcceptFrom: []string{"main"},
+	}
+
+	if errs := Validate(cfg); len(errs) == 0 {
+		t.Fatalf("expected validation errors")
+	}
+}