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>

script/collab-flamegraph

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+# Notes for fixing this script if it's broken:
+# - if you see an error about "can't find perf_6.1" you need to install `linux-perf` from the
+#   version of Debian that matches the host (e.g. apt-get -t bookworm-backports install linux-perf)
+# - if you see an error about `addr2line` you may need to install binutils
+
+set -euo pipefail
+
+source script/lib/deploy-helpers.sh
+
+if [[ $# != 1 ]]; then
+  echo "Usage: $0 <production|staging>"
+  exit 1
+fi
+environment=$1
+
+target_zed_kube_cluster
+
+# 5s in production is ~200Mb..., in staging you probably want to bump this up.
+echo "Running perf on collab, collecting 5s of data..."
+
+kubectl -n $environment exec -it deployments/collab -- perf record -p 1 -g -m 64 --call-graph dwarf -- sleep 5
+
+run="collab-$environment-$(date -Iseconds)"
+echo "Processing data and downloading to '$run.perf'..."
+
+kubectl -n $environment exec -it deployments/collab -- perf --no-pager script > "$run.perf"
+
+which inferno-flamegraph 2>/dev/null || (echo "installing inferno..."; cargo install inferno)
+
+inferno-collapse-perf "$run.perf" | inferno-flamegraph > "$run.svg"
+open "./$run.svg"