logiguard fork v2: patched GPUI on verified 8c74db0 tree

Rebuilt from the exact zed-industries/zed @ 8c74db00c4053d6c0a9037863d7bd048658da4ca
tree (previous orphan was based on a stale/wrong fetch). Same 3-file patch:
  - serial.rs: add SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; add latest_serial_of()
  - window.rs: activate() uses keyboard-enter serial (Mutter focus gate)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/edit_prediction_metrics/src/tree_sitter.rs

@@ -0,0 +1,27 @@
+pub fn count_tree_sitter_errors<'a>(nodes: impl Iterator<Item = tree_sitter::Node<'a>>) -> usize {
+    let mut total_count: usize = 0;
+    for node in nodes {
+        let mut cursor = node.walk();
+        'node: loop {
+            let current = cursor.node();
+            if current.is_error() || current.is_missing() {
+                total_count += 1;
+            }
+            if current.has_error() && cursor.goto_first_child() {
+                continue;
+            }
+            if cursor.goto_next_sibling() {
+                continue;
+            }
+            loop {
+                if !cursor.goto_parent() {
+                    break 'node;
+                }
+                if cursor.goto_next_sibling() {
+                    continue;
+                }
+            }
+        }
+    }
+    total_count
+}