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/language/src/manifest.rs

@@ -0,0 +1,28 @@
+use std::sync::Arc;
+
+use settings::WorktreeId;
+use util::rel_path::RelPath;
+
+// Re-export ManifestName from language_core.
+pub use language_core::ManifestName;
+
+/// Represents a manifest query; given a path to a file, the manifest provider is tasked with finding a path to the directory containing the manifest for that file.
+///
+/// Since parts of the path might have already been explored, there's an additional `depth` parameter that indicates to what ancestry level a given path should be explored.
+/// For example, given a path like `foo/bar/baz`, a depth of 2 would explore `foo/bar/baz` and `foo/bar`, but not `foo`.
+pub struct ManifestQuery {
+    /// Path to the file, relative to worktree root.
+    pub path: Arc<RelPath>,
+    pub depth: usize,
+    pub delegate: Arc<dyn ManifestDelegate>,
+}
+
+pub trait ManifestProvider {
+    fn name(&self) -> ManifestName;
+    fn search(&self, query: ManifestQuery) -> Option<Arc<RelPath>>;
+}
+
+pub trait ManifestDelegate: Send + Sync {
+    fn worktree_id(&self) -> WorktreeId;
+    fn exists(&self, path: &RelPath, is_dir: Option<bool>) -> bool;
+}