commit 87a53c09bc6940e69037f6de11433c48d2e5fb19
Author: ddidderr <ddidderr@paul.network>
Date:   Sat Apr 25 20:53:53 2026 +0200

    chore: add Rust project scaffold
    
    Add the initial Cargo package, formatter configuration, ignore rules, lockfile,
    and placeholder binary entry point. This establishes the repository baseline so
    future solver work can be reviewed as focused behavior changes.
    
    The scaffold intentionally contains no Sudoku behavior yet. It only captures the
    starting point of the project as generated and configured locally.
    
    Test Plan:
    - cargo clippy
    - cargo clippy --benches
    - cargo clippy --tests
    - cargo +nightly fmt
    - cargo clippy
    - cargo clippy --benches
    - cargo clippy --tests
    
    Refs: none

diff --git a/.codex b/.codex
new file mode 100644
index 0000000..e69de29
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..0201c56
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "sudoku-ai"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a45fdd3
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "sudoku-ai"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+
+[lints.rust]
+unsafe_code = "forbid"
+
+[lints.clippy]
+pedantic = { level = "warn", priority = -1 }
+todo = "warn"
+unwrap_used = "warn"
+
+[profile.release]
+lto = true
+strip = true
+codegen-units = 1
+debug = false
+panic = "unwind"
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..e270811
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,3 @@
+group_imports = "StdExternalCrate"
+imports_granularity = "Crate"
+imports_layout = "HorizontalVertical"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}