fix: fixes for shell/Terminal issues and CPU burn

programs/include/gui/terminal.hpp

@@ -20,6 +20,7 @@ struct TermCell {
 };
 
 static constexpr int TERM_MAX_SCROLLBACK = 500;
+static constexpr int TERM_MAX_READS_PER_POLL = 8;
 
 struct TerminalState {
     TermCell* cells;
@@ -716,8 +717,8 @@ static inline void terminal_handle_key(TerminalState* t, const Montauk::KeyEvent
 static inline bool terminal_poll(TerminalState* t) {
     if (t->child_pid <= 0) return false;
     char buf[4096];
-    // Drain all available data so large output renders in one frame
-    for (;;) {
+    // Drain a bounded amount per frame so window close/input events stay responsive.
+    for (int reads = 0; reads < TERM_MAX_READS_PER_POLL; reads++) {
         int n = montauk::childio_read(t->child_pid, buf, sizeof(buf));
         if (n > 0) {
             terminal_feed(t, buf, n);