diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..6d56f41
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,2 @@
+[registries.gitea]
+index = "sparse+https://gitea.woggioni.net/api/packages/woggioni/cargo/"
diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
new file mode 100644
index 0000000..43f7bf2
--- /dev/null
+++ b/.gitea/workflows/ci.yml
@@ -0,0 +1,90 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  core:
+    runs-on: woryzen
+    steps:
+      - name: Checkout
+        uses: https://github.com/RouxAntoine/checkout@v3.5.4
+      - name: Install Rust
+        run: rustup toolchain install stable --profile minimal
+      - name: Install Rust components
+        run: rustup component add --toolchain stable rustfmt clippy
+      - name: Cache
+        uses: Swatinem/rust-cache@v2
+      - name: Check formatting
+        run: cargo fmt --check
+      - name: Test default members
+        run: cargo test --locked
+      - name: Test engine
+        run: cargo test -p rdraught --features std --lib --locked
+      - name: Check shared UI crate
+        run: cargo check -p rdraught-ui-common --locked
+      - name: Check CLI scratch crate
+        run: cargo check -p rdraught-cli --locked
+      - name: Clippy (advisory)
+        run: cargo clippy -p rdraught --features std --all-targets --locked
+
+  wasm:
+    runs-on: woryzen
+    steps:
+      - name: Checkout
+        uses: https://github.com/RouxAntoine/checkout@v3.5.4
+      - name: Install Rust
+        run: rustup toolchain install stable --profile minimal
+      - name: Add wasm target
+        run: rustup target add wasm32-unknown-unknown
+      - name: Cache
+        uses: Swatinem/rust-cache@v2
+      - name: Check browser front end
+        working-directory: rdraught-wasm
+        run: cargo check --locked --target wasm32-unknown-unknown
+
+  wasm4:
+    runs-on: woryzen
+    steps:
+      - name: Checkout
+        uses: https://github.com/RouxAntoine/checkout@v3.5.4
+      - name: Install Rust
+        run: rustup toolchain install stable --profile minimal
+      - name: Add wasm target
+        run: rustup target add wasm32-unknown-unknown
+      - name: Cache
+        uses: Swatinem/rust-cache@v2
+      - name: Build WASM-4 front end
+        working-directory: rdraught-w4
+        run: cargo build --release --locked --target wasm32-unknown-unknown
+
+  msrv:
+    runs-on: woryzen
+    steps:
+      - name: Checkout
+        uses: https://github.com/RouxAntoine/checkout@v3.5.4
+      - name: Install MSRV toolchain
+        run: rustup toolchain install 1.87.0 --profile minimal
+      - name: Cache
+        uses: Swatinem/rust-cache@v2
+      - name: Test engine on MSRV
+        run: cargo +1.87.0 test -p rdraught --features std --lib --locked
+      - name: Check shared UI crate on MSRV
+        run: cargo +1.87.0 check -p rdraught-ui-common --locked
+
+  # Enable this job once the self-hosted runner has the GTK4 development
+  # libraries installed:
+  #
+  # gtk:
+  #   runs-on: woryzen
+  #   steps:
+  #     - name: Checkout
+  #       uses: https://github.com/RouxAntoine/checkout@v3.5.4
+  #     - name: Install Rust
+  #       run: rustup toolchain install stable --profile minimal
+  #     - name: Cache
+  #       uses: Swatinem/rust-cache@v2
+  #     - name: Check GTK front end
+  #       run: cargo check -p rdraught-gtk --all-targets --locked
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new file mode 100644
index 0000000..fb6deed
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diff --git a/Cargo.toml b/Cargo.toml
index bde2c2f..cc54521 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,13 +8,16 @@ members = [
   "rdraught-sdl",
   "rdraught-ui-common",
 ]
+# Frontends requiring system libraries or a wasm target are checked explicitly.
+# See README.md for their build commands.
+default-members = ["rdraught", "rdraught-ui-common"]
 resolver = "3"
 
 [workspace.package]
 homepage = "https://gitea.woggioni.net/woggioni/rdraught"
 authors = ["Walter Oggioni <oggioni.walter@gmail.com>"]
 version = "0.1.0"
-repository = "https://github.com/gtk-rs/gtk-rs-core"
+repository = "https://gitea.woggioni.net/woggioni/rdraught"
 license = "MIT"
 edition = "2024"
 rust-version = "1.87"
diff --git a/README.md b/README.md
index f82327b..272d80f 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,121 @@
 # rdraught
 
+A draughts (checkers) engine written in Rust, with a `no_std` core library and
+several front ends.
+
+## Workspace
+
+| Crate | Description |
+| --- | --- |
+| `rdraught` | `no_std` game engine, move generation, AI, and undo/redo history. |
+| `rdraught-ui-common` | Small geometry and shared-state helpers used by the graphical front ends. |
+| `rdraught-gtk` | GTK4 desktop front end (the most complete one). |
+| `rdraught-wasm` | Browser front end using the Canvas 2D API and `wasm-bindgen`. |
+| `rdraught-w4` | WASM-4 front end. Work in progress. |
+| `rdraught-sdl` | SDL3 front end. Work in progress. |
+| `rdraught-cli` | Scratch `rustyline` program; not a playable CLI yet. |
+
+## Rules
+
+The rules implemented by the engine are an 8x8 draughts variant:
+
+- Each player starts with twelve men.
+- Captures are mandatory.
+- Men move one square diagonally forward.
+- Men cannot capture backwards in this implementation.
+- Kings move one square diagonally in any direction and can capture in any
+  direction.
+- A man is promoted to a king when it reaches the opponent's back row.
+- Draw rules (repetition, move limits) are not implemented yet.
+
+## Requirements
+
+- Rust 1.87 or newer. The workspace uses edition 2024.
+- `rustfmt` and `clippy` for the checks described below.
+- GTK4 development packages (including Graphene and librsvg) for
+  `rdraught-gtk`.
+- The `wasm32-unknown-unknown` target and [Trunk](https://trunkrs.dev/) for
+  `rdraught-wasm`.
+- The WASM-4 toolchain for `rdraught-w4`.
+- A C/C++ toolchain for `rdraught-sdl`, which builds SDL3 from source.
+
+On Debian/Ubuntu, the GTK front end needs packages such as:
+
+```sh
+sudo apt install libgtk-4-dev libgraphene-1.0-dev librsvg2-dev pkg-config
+```
+
+## Building and testing
+
+The default workspace members are `rdraught` and `rdraught-ui-common`, so the
+common host-side checks do not require GTK or a wasm target:
+
+```sh
+cargo test
+cargo test -p rdraught --features std
+cargo fmt --check
+cargo clippy -p rdraught --features std --all-targets
+```
+
+The draughts and AI unit tests are gated behind the `std` feature because they
+use `std::collections::HashMap`.
+
+`cargo test --workspace` requires all front-end prerequisites (GTK libraries,
+the wasm target, and the SDL build toolchain). Use the per-front-end commands
+below instead.
+
+### GTK
+
+```sh
+cargo run -p rdraught-gtk
+```
+
+### Browser WASM
+
+```sh
+rustup target add wasm32-unknown-unknown
+cd rdraught-wasm
+trunk serve --open
+```
+
+The `.cargo/config.toml` inside `rdraught-wasm` is only read when Cargo runs
+from that directory.
+
+### WASM-4
+
+```sh
+cd rdraught-w4
+cargo build --release --target wasm32-unknown-unknown
+```
+
+Run Cargo from `rdraught-w4` so its linker configuration is applied. The
+resulting module is in `target/wasm32-unknown-unknown/release/`.
+
+### SDL3
+
+```sh
+cargo run -p rdraught-sdl
+```
+
+The first build compiles SDL3 from source and can take a while.
+
+### CLI scratch program
+
+```sh
+cargo run -p rdraught-cli --bin rustyline-test
+```
+
+## Dependencies
+
+`rdraught-ui-common` uses `rmath`, which is published in the author's Gitea
+Cargo registry. The required registry configuration is committed in
+`.cargo/config.toml`, so no extra local setup is needed:
+
+```toml
+[registries.gitea]
+index = "sparse+https://gitea.woggioni.net/api/packages/woggioni/cargo/"
+```
+
+## License
+
+MIT. See [LICENSE](LICENSE).
diff --git a/rdraught-gtk/examples/ai_debugger.rs b/rdraught-gtk/examples/ai_debugger.rs
index 5ad2a6e..1ceec91 100644
--- a/rdraught-gtk/examples/ai_debugger.rs
+++ b/rdraught-gtk/examples/ai_debugger.rs
@@ -2,6 +2,7 @@ use glib::ExitCode;
 use rdraught::{DraughtsBoard, DraughtsGame, Move, Piece, Player, Position};
 use rdraught_gtk::run;
 use std::collections::HashMap;
+use std::mem::size_of;
 
 fn main() -> ExitCode {
     println!("move: {}", size_of::<Move>());
diff --git a/rdraught-wasm/dist/index.html b/rdraught-wasm/dist/index.html
deleted file mode 100644
index 9cf2726..0000000
--- a/rdraught-wasm/dist/index.html
+++ /dev/null
@@ -1,27 +0,0 @@
-<!DOCTYPE html>
-<html>
-
-<head>
-  <meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
-  <style>
-    body {
-      margin: 0px;
-    }
-  </style>
-<link rel="modulepreload" href="/rdraught-wasm-1d648b9090e33d1f.js" crossorigin="anonymous" integrity="sha384-T7IqpVlu6X9Lrf6TI9E2mHL6bPl2B4DHWKUGmbtsfGa1QSmnJBFB8IRe7clx0yWb"><link rel="preload" href="/rdraught-wasm-1d648b9090e33d1f_bg.wasm" crossorigin="anonymous" integrity="sha384-v+/7HPNa68RnAHRmXFFl7L7bUCWjUJnc8AGKHfn6l5NJiPANQ7yqdGRb+abf1wyh" as="fetch" type="application/wasm"></head>
-
-<body>
-
-<script type="module">
-import init, * as bindings from '/rdraught-wasm-1d648b9090e33d1f.js';
-const wasm = await init({ module_or_path: '/rdraught-wasm-1d648b9090e33d1f_bg.wasm' });
-
-
-window.wasmBindings = bindings;
-
-
-dispatchEvent(new CustomEvent("TrunkApplicationStarted", {detail: {wasm}}));
-
-</script></body>
-
-</html>
\ No newline at end of file
diff --git a/rdraught/examples/checkers.rs b/rdraught/examples/checkers.rs
index 8addac8..522efa5 100644
--- a/rdraught/examples/checkers.rs
+++ b/rdraught/examples/checkers.rs
@@ -1,5 +1,5 @@
 use heapless::Vec;
-use rdraught::{DraughtsBoard, Piece, Position};
+use rdraught::{DraughtsBoard, Piece};
 
 fn main() {
     let board = DraughtsBoard::default();
@@ -15,8 +15,7 @@ fn main() {
 
     board
         .pieces(pieces)
-        .for_each(|pos| println!("({}, {}): {:?}", pos.row(), pos.col(), board[pos]));
-    // println!("{:?}", board[Position::new(0, 0)]);
+        .for_each(|pos| println!("({}, {}): {:?}", pos.row(), pos.col(), board.get(pos)));
 
     // board
     //     .moves_for_piece(Position::new(2, 0), false)