logiguard fork: GPUI xdg-activation keyboard-focus serial fix

Single-commit orphan branch: full zed-industries/zed @ 8c74db0 source tree
with a 3-file patch applied (no upstream history).

Patch (crates/gpui_linux/src/linux/wayland/):
  - 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)

Mutter honors window activation only when the token carries the keyboard-
focus serial from wl_keyboard.enter; GPUI used a stale mouse-press serial.
See docs/tray-window-focus-wayland.md in logiguard.

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

crates/edit_prediction_cli/evals/codex-acp--add-derive.md

@@ -0,0 +1,69 @@
++++
+repository_url = "https://github.com/zed-industries/codex-acp"
+revision = "c3d24ee70928fc9da08c131fc632d624413ccc43"
++++
+
+## Edit History
+
+```diff
+--- a/src/prompt_args.rs
++++ b/src/prompt_args.rs
+@@ -28,7 +28,7 @@ impl PromptArgsError {
+     }
+ }
+
+-#[derive(Debug)]
++#[derive(Debug, Serialize)]
+ pub enum PromptExpansionError {
+     Args {
+         command: String,
+```
+
+## Cursor Position
+
+```src/prompt_args.rs
+#[derive(Debug)]
+pub enum PromptArgsError {
+//                      ^[CURSOR_POSITION]
+    MissingAssignment { token: String },
+    MissingKey { token: String },
+}
+```
+
+## Expected Patch
+
+```diff
+--- a/src/prompt_args.rs
++++ b/src/prompt_args.rs
+@@ -9,7 +9,7 @@ use std::sync::LazyLock;
+ static PROMPT_ARG_REGEX: LazyLock<Regex> =
+     LazyLock::new(|| Regex::new(r"\$[A-Z][A-Z0-9_]*").unwrap_or_else(|_| std::process::abort()));
+
+-#[derive(Debug)]
++#[derive(Debug, Serialize)]
+ pub enum PromptArgsError {
+     MissingAssignment { token: String },
+     MissingKey { token: String },
+```
+
+```diff
+--- a/src/prompt_args.rs
++++ b/src/prompt_args.rs
+@@ -3,19 +3,20 @@
+ use regex_lite::Regex;
++use serde::Serialize;
+ use shlex::Shlex;
+ use std::collections::HashMap;
+ use std::collections::HashSet;
+ use std::sync::LazyLock;
+
+ static PROMPT_ARG_REGEX: LazyLock<Regex> =
+     LazyLock::new(|| Regex::new(r"\$[A-Z][A-Z0-9_]*").unwrap_or_else(|_| std::process::abort()));
+
+-#[derive(Debug)]
++#[derive(Debug, Serialize)]
+ pub enum PromptArgsError {
+     MissingAssignment { token: String },
+     MissingKey { token: String },
+ }
+```