From 1a6b28698d14872a6fcda4c2c2fac930f9b170e4 Mon Sep 17 00:00:00 2001
From: Kayshen-X <kayshen_xu@163.com>
Date: Sun, 3 May 2026 22:10:00 +0800
Subject: [PATCH] =?UTF-8?q?feat(openpencil-shell-core):=20skeleton=20crate?=
 =?UTF-8?q?=20(kickoff=20=C2=A71.2=20three-crate=20split)?=
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---
 crates/openpencil-shell-core/Cargo.toml | 23 +++++++++++++++++++++++
 crates/openpencil-shell-core/src/lib.rs | 20 ++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 crates/openpencil-shell-core/Cargo.toml
 create mode 100644 crates/openpencil-shell-core/src/lib.rs

diff --git a/crates/openpencil-shell-core/Cargo.toml b/crates/openpencil-shell-core/Cargo.toml
new file mode 100644
index 000000000..38b1df2d2
--- /dev/null
+++ b/crates/openpencil-shell-core/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "openpencil-shell-core"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+description = "OpenPencil shell — retained-mode widget tree, RenderBackend trait, parley + taffy (kickoff spec §1.2)"
+
+[lib]
+name = "openpencil_shell_core"
+path = "src/lib.rs"
+
+[dependencies]
+serde = { workspace = true, optional = true }
+
+# Pinned per Task 0.4 wasm32 feature matrix verdict
+# (notes/2026-05-02-parley-wasm-feature-matrix.md "## 结论" 段)
+parley = { version = "0.2", default-features = false, features = ["std"] }
+taffy = { version = "0.6", default-features = false, features = ["std", "taffy_tree", "flexbox", "grid", "block_layout", "content_size"] }
+
+[features]
+default = []
+serde = ["dep:serde"]
diff --git a/crates/openpencil-shell-core/src/lib.rs b/crates/openpencil-shell-core/src/lib.rs
new file mode 100644
index 000000000..baeb1b45d
--- /dev/null
+++ b/crates/openpencil-shell-core/src/lib.rs
@@ -0,0 +1,20 @@
+//! OpenPencil shell core — platform-agnostic widget tree + render-backend trait.
+//!
+//! Per kickoff spec §1.2 (FROZEN 2026-05-02): this crate must compile on
+//! wasm32-unknown-unknown. winit / accesskit_winit / skia-safe live in
+//! `openpencil-shell-native`; wasm-bindgen / web-sys / CanvasKit live in
+//! `openpencil-shell-web`.
+
+pub fn placeholder() -> &'static str {
+    "openpencil-shell-core skeleton"
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn skeleton_returns_string() {
+        assert_eq!(placeholder(), "openpencil-shell-core skeleton");
+    }
+}