Check generator: run a .wasm generator's Describe on request, sandboxed

language-server#90 offers "Check generator" on a comline.toml generator entry, but disabled: running a .wasm generator's Describe needs a wasmtime sandbox in the language server.
Port the CLI's runner (cli src/external.rs): no preopens, no env or network, a wall-time limit, a memory cap. Run it only when the user asks, never automatically. Native generators stay refused.
Show the generator's languages and versions, and check them against the target.

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