chore(browser): drop dead workspace_id alias lookups

Followup to 7e36420. P2 made cli_session_name the only key the
AgentBrowserManager registers, so the workspace_id fallbacks in
control.rs (vision_port) and commands/workspace.rs (close-on-teardown)
never match anything. Remove them and refresh the stale comments.

Author: Zeus-Deus

src-tauri/src/commands/workspace.rs

@@ -704,11 +704,13 @@ pub fn close_workspace(
     }
 
     // Close agent browser CLI session for this workspace.
-    // Release port entries for both cli_session_name and workspace_id keys.
+    // P2 from docs/plans/browser-stream-fix.md removed the workspace_id
+    // alias the manager used to register, so closing under
+    // cli_session_name is sufficient — there is no longer a second key
+    // to reap.
     {
         let cli_name = state.find_detached_agent_browser(&workspace_id)
             .map(|s| s.cli_session_name.clone());
-        let ws_id = workspace_id.clone();
         let app_handle = app.clone();
         tauri::async_runtime::spawn(async move {
             let manager: State<'_, AgentBrowserManager> = app_handle.state();
@@ -717,8 +719,6 @@ pub fn close_workspace(
                     eprintln!("[AGENT_BROWSER] Failed to close agent browser for workspace: {error}");
                 }
             }
-            // Also remove the workspace_id port entry (may be a separate HashMap key).
-            let _ = manager.close(&ws_id).await;
         });
     }
 

src-tauri/src/control.rs

@@ -768,9 +768,10 @@ async fn dispatch_request(app: &AppHandle, request: ControlRequest) -> ControlRe
             };
 
             // Get the port for this session (already allocated above or in start_stream).
-            // Try cli_session_name first (key used by start_stream/close), then workspace_id.
+            // P2 from docs/plans/browser-stream-fix.md removed the
+            // `workspace_id` alias the manager used to register, so
+            // `cli_session_name` is the only key the manager knows.
             let vision_port = agent_browser.get_port(&cli_session_name).await
-                .or(agent_browser.get_port(&workspace_id).await)
                 .unwrap_or(crate::agent_browser::DEFAULT_STREAM_PORT);
 
             let result = match action_kind.as_str() {