feat: add websocket browser service runtime

Wire the service/browser runtime onto the websocket-driven execution path and add the new browser/service modules needed for the submit flow and runtime integration.

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

src/lib.rs

@@ -1,10 +1,14 @@
 pub mod agent;
+pub mod browser;
 pub mod compat;
 pub mod config;
 pub mod llm;
 pub mod pipe;
 pub mod runtime;
 pub mod security;
+pub mod service;
+
+pub use browser::ws_probe::{parse_probe_args, run_probe_script, ProbeError, ProbeOutcome};
 
 use std::path::PathBuf;
 use std::sync::Arc;