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>

script/randomized-test-ci

@@ -0,0 +1,70 @@
+#!/usr/bin/env node --redirect-warnings=/dev/null
+
+const fs = require("fs");
+const { randomBytes } = require("crypto");
+const { execFileSync } = require("child_process");
+const {
+  minimizeTestPlan,
+  buildTests,
+  runTests,
+} = require("./randomized-test-minimize");
+
+const { ZED_SERVER_URL } = process.env;
+if (!ZED_SERVER_URL) throw new Error("Missing env var `ZED_SERVER_URL`");
+
+main();
+
+async function main() {
+  buildTests();
+
+  const seed = randomU64();
+  const commit = execFileSync("git", ["rev-parse", "HEAD"], {
+    encoding: "utf8",
+  }).trim();
+
+  console.log("commit:", commit);
+  console.log("starting seed:", seed);
+
+  const planPath = "target/test-plan.json";
+  const minPlanPath = "target/test-plan.min.json";
+  const failingSeed = runTests({
+    SEED: seed,
+    SAVE_PLAN: planPath,
+    ITERATIONS: 50000,
+    OPERATIONS: 200,
+  });
+
+  if (!failingSeed) {
+    console.log("tests passed");
+    return;
+  }
+
+  console.log("found failure at seed", failingSeed);
+  const minimizedSeed = minimizeTestPlan(planPath, minPlanPath);
+  const minimizedPlan = fs.readFileSync(minPlanPath, "utf8");
+
+  console.log("minimized plan:\n", minimizedPlan);
+
+  const url = `${ZED_SERVER_URL}/api/randomized_test_failure`;
+  const body = {
+    seed: minimizedSeed,
+    plan: JSON.parse(minimizedPlan),
+    commit: commit,
+  };
+  await fetch(url, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(body),
+  });
+
+  process.exit(1);
+}
+
+function randomU64() {
+  const bytes = randomBytes(8);
+  const hexString = bytes.reduce(
+    (string, byte) => string + byte.toString(16),
+    "",
+  );
+  return BigInt("0x" + hexString).toString(10);
+}