feat: expand local operator controls across CLI and WebUI

- Add structured CLI commands for status/kernel/settings/plugins/memory/knowledge/agents
- Inject core dependencies directly into CLI plugin for non-HTTP operator workflows
- Add plugin management panel and API proxy endpoints to WebUI
- Let cmd_run inherit default workdir from core.agent.workdir
- Use fixed loopback address for pluginmgr API
- Remove stale MaxToolTurns config usage from homed wiring

internal/plugins/webui/handler_test.go

@@ -606,7 +606,6 @@ func TestHandleCompletionsEndToEnd(t *testing.T) {
 		IO:            iom,
 		Memory:        memDB,
 		Indexer:       nil,
-		MaxToolTurns:  0,
 		ContextSavePath: "",
 	})
 	agent.Start()