feat(plugins): add lightweight plugin system with discovery, registry, and injection

crates/tui/assets/plugins/rust-toolkit/plugin.toml

@@ -0,0 +1,12 @@
+[plugin]
+name = "rust-toolkit"
+description = "Rust development tools: cargo check, clippy, and test runner"
+version = "1.0.0"
+default_enabled = false
+
+[skills]
+paths = ["skills/rust-check/"]
+
+[when]
+os = ["linux", "windows", "macos"]
+required_binaries = ["cargo"]

crates/tui/assets/plugins/rust-toolkit/skills/rust-check/SKILL.md

@@ -0,0 +1,16 @@
+---
+name: rust-check
+type: check
+when_to_use: Check Rust code compilation and clippy linting
+argument_hint: "[file or directory to check]"
+allowed_tools: ["read_file", "exec_shell:check-only"]
+---
+
+# rust-check — Rust code quality check
+
+Run `cargo check` and `cargo clippy` on the specified Rust project or file.
+
+1. If given a file path, run `cargo check` in the crate containing that file
+2. If given a directory, run `cargo check` in that directory
+3. If no path is given, check the current project
+4. Report any compilation errors or clippy warnings