Add simple-lang development skill

skills/.curated/simple-lang/SKILL.md

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+# Simple Language Development
+
+Development skill for the [Simple Language](https://github.com/ormastes/simple) compiler and toolchain.
+
+## What it does
+
+Provides 68 MCP tools for Simple Language projects:
+- **Code intelligence** — diagnostics, completions, hover, go-to-definition for `.spl`/`.shs` files
+- **Debugging** — DAP integration, breakpoints, step execution, variable inspection
+- **Build** — compile, native-build, release, cross-compilation
+- **Test** — run specs, SSpec BDD framework, test isolation
+- **VCS** — jj (Jujutsu) operations, commit, push, rebase
+- **Analysis** — code search, symbol lookup, documentation coverage
+
+## Setup
+
+Install the MCP server:
+
+```bash
+npx @simple-lang/mcp-server
+```
+
+Or add to your Codex config (`.codex/config.toml`):
+
+```toml
+[mcp.simple-mcp]
+command = "npx"
+args = ["-y", "@simple-lang/mcp-server"]
+```
+
+## Links
+
+- **Repository:** https://github.com/ormastes/simple
+- **npm:** https://www.npmjs.com/package/@simple-lang/mcp-server
+- **MCP Registry:** https://registry.modelcontextprotocol.io/servers/io.github.ormastes/simple-mcp-server