wasip2 / wit-bindgen: restore older versions compatible with rustc 1.81

## Summary

All published versions of `wasip2` (and its `wit-bindgen` dependency) require **rustc 1.82+**, but we're on **rustc 1.81.0**. The oldest version on crates.io (`1.0.0+wasi-0.2.4`) is only a few months old, while the project is much older, suggesting older versions compatible with rustc 1.81 were removed.

## Error

```
error: rustc 1.81.0 is not supported by the following packages:
wasip2@1.0.0+wasi-0.2.4 requires rustc 1.82.0
wit-bindgen@0.45.1 requires rustc 1.82.0
...
Either upgrade rustc or select compatible dependency versions with
`cargo update @ --precise `
where `` is the latest version supporting rustc 1.81.0
```

Pinning `wasip2` to an older version doesn't work: **there is no published version of wasip2 that supports rustc 1.81** (only three versions exist on crates.io, all requiring ≥1.82).

## Request

Please restore older versions of `wasip2` that are compatible with rustc 1.81.0, or publish a new version that supports rustc 1.81.0.

## Context

`wasip2` is a transitive dependency in our project (via `getrandom` → `rand_core` → `rand` → `ulid` → common crates). We cannot upgrade to rustc 1.82+ immediately, so we need versions compatible with rustc 1.81.

Start by reviewing the published wasip2 and wit-bindgen versions on crates.io and their rustc requirements, then trace the dependency path through getrandom, rand_core, rand, and ulid. Done means identifying or publishing versions that work with rustc 1.81.0 and confirming the dependency resolution succeeds.

Written by the indexing model from the issue text.