0.1.0-0-pre.1

crates/engines/engine-v1-sdl/Cargo.toml

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+# file: crates/engines/engine-v1-sdl/Cargo.toml
+# version: 1
+
+[package]
+name = "engine-v1-sdl"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+authors.workspace = true
+publish.workspace = true
+
+[dependencies]
+engine-v1-common = { path = "../engine-v1-common" }
+
+[lints]
+workspace = true

crates/engines/engine-v1-sdl/src/lib.rs

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+// file: crates/engines/engine-v1-sdl/src/lib.rs
+// version: 1
+
+#![warn(missing_docs)]
+#![deny(unreachable_pub)]
+#![forbid(unsafe_code)]
+
+//! SDL boundary for engine generation V1.
+//!
+//! The baseline intentionally contains only the boundary type. The external SDL3 dependency is introduced in the dedicated SDL integration delta.
+
+mod runtime;
+
+/// Re-export of the SDL runtime boundary marker.
+pub use self::runtime::SdlRuntimeBoundary;

crates/engines/engine-v1-sdl/src/runtime.rs

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+// file: crates/engines/engine-v1-sdl/src/runtime.rs
+// version: 1
+
+/// Marker representing the future SDL3 runtime boundary for engine V1.
+#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
+pub struct SdlRuntimeBoundary;
+
+impl SdlRuntimeBoundary {
+    /// Returns the engine generation served by this boundary.
+    #[must_use]
+    pub const fn engine_generation() -> u16 {
+        return 1;
+    }
+}