Initial commit: rust-craft plugin

Rust-on-NixOS knowledge plugin. Relocates plugin.json into .claude-plugin/
so it loads as a proper plugin, and adds README/LICENSE/.gitignore for
distribution. Skill rust-nix-toolchain (Cranelift vs LLVM codegen, fenix
nightly pins, cargo/clippy gates) with cranelift-limitations reference.

README.md

@@ -0,0 +1,23 @@
+# claude-plugin-rust-craft
+
+Claude Code plugin — Rust development knowledge for NixOS environments: toolchain management, codegen backends, and common pitfalls.
+
+## Installation
+
+Add to your Claude Code plugin list or install from the [plugin registry](https://claude-plugins.oleks.space):
+
+```
+claude plugin add https://claude-plugins.oleks.space/plugins/rust-craft.git
+```
+
+## Usage
+
+Skills from this plugin are automatically available in Claude Code conversations when installed.
+
+## Skills
+
+- **rust-nix-toolchain** — Cranelift vs LLVM codegen backend issues (`asm!`/`global_asm!` sym operands, wasmtime-fiber failures, "cargo test fails but cargo check works"), NixOS fenix nightly toolchain pins, and cargo/clippy quality-gate patterns. See `skills/rust-nix-toolchain/references/cranelift-limitations.md`.
+
+## License
+
+MIT