refactor: remove dead utils/bench.rs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

GEMINI.md

@@ -0,0 +1,56 @@
+# GEMINI.md
+
+## Project Overview
+
+This project is a `gtklock` module named `ahfail`, written in Rust (using `gtk-rs`) with a Meson build system.
+
+The module listens for failed unlock attempts (`PW_FAILURE`) in `gtklock`. Upon failure, it:
+1.  Spawns a looping "Nedry" sprite animation at a random screen location.
+2.  Plays an audio clip ("ah ah ah, you didn't say the magic word").
+3.  Avoids placing sprites in a user-configurable "deadzone".
+
+All assets (images and audio) are compiled into the module binary as GResources.
+
+## Build Architecture
+
+*   **Meson:** The primary build system. It handles:
+    *   Compiling GResources (`assets/ahfail.gresource.xml`).
+    *   Invoking Cargo to build the Rust code as a static library (`libahfail_module.a`).
+    *   Linking the Rust static library, GResources, and C dependencies into the final shared object (`ahfail-module.so`).
+*   **Cargo:** Handles the Rust source code, dependencies (`gtk`, `gdk`, `gstreamer`), and tests.
+
+## Key Files
+
+*   `src/lib.rs`: FFI entry points (`on_activation`, `on_window_create`, etc.) exported to C.
+*   `src/handler.rs`: Main logic for sprite placement and audio playback.
+*   `src/config.rs`: Argument parsing logic.
+*   `tests/ahfail_tests.rs`: Comprehensive integration tests mocking `gtklock` behavior.
+*   `meson.build`: Build definition bridging C and Rust.
+
+## Building and Running
+
+### Prerequisites
+*   Meson, Ninja, Rust (Cargo)
+*   `gtk3` development headers
+*   `gstreamer` + `gst-plugins-base` + `gst-plugins-good` (runtime)
+
+### Commands
+```bash
+# Setup
+meson setup builddir
+
+# Build
+meson compile -C builddir
+
+# Test (Rust logic)
+cargo test
+
+# Run (Manual test)
+gtklock -d -m builddir/ahfail-module.so -- --deadzone=X,Y,W,H
+```
+
+## Development Conventions
+
+*   **Safety:** Use `WindowContext` wrappers in `src/context.rs` to handle unsafe `Window` pointers.
+*   **State:** `MODULE_STATE` (thread-local) holds global config/assets. `WindowData` (heap-allocated) holds per-window sprites and players.
+*   **Tests:** `tests/ahfail_tests.rs` contains integration tests that mock `gtklock` structures. Run with `cargo test`.