refactor(web_ui): Bus::effective_context_window, sigint_claude + per-connection hello, relocate fetch_reminder_stats, drop redundant guard

hive-ag3nt/src/web_ui/auth.rs

@@ -84,10 +84,7 @@ pub(super) async fn post_login_cancel(State(state): State<AppState>) -> Response
 /// preservation invariants.
 pub(super) async fn post_logout(State(state): State<AppState>) -> Response {
     // Step 1: SIGINT claude (best-effort, matches `post_cancel_turn`).
-    let _ = tokio::process::Command::new("pkill")
-        .args(["-INT", "claude"])
-        .output()
-        .await;
+    let _ = super::sigint_claude().await;
     // Step 2: delete OAuth credential files only — login::clear_session owns
     // the file set and preserves session-history files alongside them.
     let dir = crate::paths::claude_dir();