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/agent/Cargo.toml

@@ -0,0 +1,108 @@
+[package]
+name = "agent"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "GPL-3.0-or-later"
+
+[lib]
+path = "src/agent.rs"
+
+[features]
+test-support = ["db/test-support"]
+unit-eval = []
+e2e = []
+
+[lints]
+workspace = true
+
+[dependencies]
+acp_thread.workspace = true
+action_log.workspace = true
+async-channel.workspace = true
+agent-client-protocol.workspace = true
+agent_servers.workspace = true
+agent_settings.workspace = true
+agent_skills.workspace = true
+anyhow.workspace = true
+chrono.workspace = true
+client.workspace = true
+cloud_api_types.workspace = true
+cloud_llm_client.workspace = true
+collections.workspace = true
+context_server.workspace = true
+db.workspace = true
+feature_flags.workspace = true
+fs.workspace = true
+futures.workspace = true
+git.workspace = true
+gpui.workspace = true
+handlebars = { workspace = true, features = ["rust-embed"] }
+heck.workspace = true
+html_to_markdown.workspace = true
+http_client.workspace = true
+indoc.workspace = true
+itertools.workspace = true
+language.workspace = true
+language_model.workspace = true
+language_models.workspace = true
+log.workspace = true
+parking_lot.workspace = true
+paths.workspace = true
+project.workspace = true
+prompt_store.workspace = true
+quick-xml.workspace = true
+regex.workspace = true
+rust-embed.workspace = true
+schemars.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+settings.workspace = true
+shell_command_parser.workspace = true
+smallvec.workspace = true
+sqlez.workspace = true
+streaming_diff.workspace = true
+strsim.workspace = true
+task.workspace = true
+telemetry.workspace = true
+text.workspace = true
+thiserror.workspace = true
+ui.workspace = true
+url.workspace = true
+util.workspace = true
+uuid.workspace = true
+watch.workspace = true
+web_search.workspace = true
+zed_env_vars.workspace = true
+zstd.workspace = true
+
+[dev-dependencies]
+async-io.workspace = true
+agent_servers = { workspace = true, "features" = ["test-support"] }
+client = { workspace = true, "features" = ["test-support"] }
+clock = { workspace = true, "features" = ["test-support"] }
+context_server = { workspace = true, "features" = ["test-support"] }
+ctor.workspace = true
+db = { workspace = true, "features" = ["test-support"] }
+editor = { workspace = true, "features" = ["test-support"] }
+env_logger.workspace = true
+eval_utils.workspace = true
+fs = { workspace = true, "features" = ["test-support"] }
+git = { workspace = true, "features" = ["test-support"] }
+gpui = { workspace = true, "features" = ["test-support"] }
+gpui_tokio.workspace = true
+language = { workspace = true, "features" = ["test-support"] }
+language_model = { workspace = true, "features" = ["test-support"] }
+lsp = { workspace = true, "features" = ["test-support"] }
+pretty_assertions.workspace = true
+project = { workspace = true, "features" = ["test-support"] }
+rand.workspace = true
+reqwest_client.workspace = true
+settings = { workspace = true, "features" = ["test-support"] }
+tempfile.workspace = true
+
+theme = { workspace = true, "features" = ["test-support"] }
+
+unindent = { workspace = true }
+
+zlog.workspace = true