[andreaTP]

Runs every Rust command program from the component corpus through WasiPreview2 and checks its exit code, stdout and stderr against the spec beside it. Each spec was recorded by running its program on wasmtime with the corpus's verify.sh, so a pass means the same result wasmtime gave.

All 11 programs pass: hello, args, env, exiting with success and with failure, an empty stdin, file read/write, directory listing, random and clocks. This is the first time real wasm32-wasip2 programs built by a stock Rust toolchain run end to end on endive-cm.

The spec format has no field for stdin, so stdin is always empty. Rust's standard library only reports success or failure, so the exit codes checked are 0 and 1.

CorpusCommandTest mirrors Endive's WASI test runner:

• it copies the spec's root fixture into an in-memory ZeroFS preopened as /;
• it passes [name, args...] and env;
• it captures stdout and stderr, calls run, and compares the exit code and output.

The programs rely on the corpus (#71), wasi:cli (#70) and version-compatible linking (#69), since they import @0.2.6. All three are on main, so this is now the single test commit on top.

[andreaTP]

This is now ready for review 🙏