feat: add config-owned direct submit runtime

Keep browser-attached workflows on the configured direct-skill path and align the Zhihu export/browser regression contracts with the current ws merge state.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/runtime_task_flow_test.rs

@@ -51,7 +51,12 @@ fn submit_task_without_llm_configuration_returns_clear_error() {
     assert!(matches!(
         &sent[0],
         AgentMessage::LogEntry { level, message }
-            if level == "info" && message == "sgclaw runtime version=0.1.0 protocol=1.0"
+            if level == "info"
+                && message
+                    == &format!(
+                        "sgclaw runtime version={} protocol=1.0",
+                        env!("CARGO_PKG_VERSION")
+                    )
     ));
     assert!(matches!(
         &sent[1],