Fix container name handling for hyphenated service names

Extract ContainerNameFor and SplitContainerName into names.go.
ContainerNameFor handles single-component services where service
name equals component name (e.g., mc-proxy → "mc-proxy" not
"mc-proxy-mc-proxy"). SplitContainerName checks known services
from the registry before falling back to naive split on "-", fixing
mc-proxy being misidentified as service "mc" component "proxy".

Also fixes podman ps JSON parsing (Command field is []string not
string) found during deployment.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/agent/deploy.go

@@ -49,7 +49,7 @@ func (a *Agent) Deploy(ctx context.Context, req *mcpv1.DeployRequest) (*mcpv1.De
 // deployComponent handles the full deploy lifecycle for a single component.
 func (a *Agent) deployComponent(ctx context.Context, serviceName string, cs *mcpv1.ComponentSpec, active bool) *mcpv1.ComponentResult {
 	compName := cs.GetName()
-	containerName := serviceName + "-" + compName
+	containerName := ContainerNameFor(serviceName, compName)
 
 	desiredState := "running"
 	if !active {