logiguard fork v3: full patch set on verified 8c74db0 tree

Includes prior-session patches (carry forward so the app compiles):
  - crates/gpui/build.rs: cross-compile manifest fix
  - crates/gpui/src/platform.rs: PlatformWindow::activate_with_token trait method
  - crates/gpui/src/window.rs: Window::activate_with_token public API
  - crates/gpui_linux/src/linux/wayland/window.rs: WaylandWindow::activate_with_token + activate() keyboard-serial fix

Plus the focus-serial fix:
  - serial.rs: SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; latest_serial_of()

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

crates/extension_api/README.md

@@ -0,0 +1,77 @@
+# The Zed Rust Extension API
+
+This crate lets you write extensions for Zed in Rust.
+
+## Extension Manifest
+
+You'll need an `extension.toml` file at the root of your extension directory, with the following structure:
+
+```toml
+id = "my-extension"
+name = "My Extension"
+description = "..."
+version = "0.0.1"
+schema_version = 1
+authors = ["Your Name <you@example.com>"]
+repository = "https://github.com/your/extension-repository"
+```
+
+## Cargo metadata
+
+Zed extensions are packaged as WebAssembly files. In your Cargo.toml, you'll
+need to set your `crate-type` accordingly:
+
+```toml
+[dependencies]
+zed_extension_api = "0.6.0"
+
+[lib]
+crate-type = ["cdylib"]
+```
+
+## Implementing an Extension
+
+To define your extension, create a type that implements the `Extension` trait, and register it.
+
+```rust
+use zed_extension_api as zed;
+
+struct MyExtension {
+    // ... state
+}
+
+impl zed::Extension for MyExtension {
+    // ...
+}
+
+zed::register_extension!(MyExtension);
+```
+
+## Testing your extension
+
+To run your extension in Zed as you're developing it:
+
+- Make sure you have [Rust installed](https://www.rust-lang.org/learn/get-started)
+- Have the `wasm32-wasip2` target installed (`rustup target add wasm32-wasip2`)
+- Open the extensions view using the `zed: extensions` action in the command palette.
+- Click the `Install Dev Extension` button in the top right
+- Choose the path to your extension directory.
+
+## Compatible Zed versions
+
+Extensions created using newer versions of the Zed extension API won't be compatible with older versions of Zed.
+
+Here is the compatibility of the `zed_extension_api` with versions of Zed:
+
+| Zed version | `zed_extension_api` version |
+| ----------- | --------------------------- |
+| `0.192.x`   | `0.0.1` - `0.6.0`           |
+| `0.186.x`   | `0.0.1` - `0.5.0`           |
+| `0.184.x`   | `0.0.1` - `0.4.0`           |
+| `0.178.x`   | `0.0.1` - `0.3.0`           |
+| `0.162.x`   | `0.0.1` - `0.2.0`           |
+| `0.149.x`   | `0.0.1` - `0.1.0`           |
+| `0.131.x`   | `0.0.1` - `0.0.6`           |
+| `0.130.x`   | `0.0.1` - `0.0.5`           |
+| `0.129.x`   | `0.0.1` - `0.0.4`           |
+| `0.128.x`   | `0.0.1`                     |