Release 0.3.1 at 3631d4a.
Patch release: the Rust side moves to wasmtime 48.0.1 (wasmtime, wasmtime-wasi, wasmtime-wizer, and the CLI pin in scripts/setup.sh) and wit-bindgen 0.61.1 (#107). No source changes were required and every expected/ golden and lockfile is byte-identical across all four runner paths. The JS package (@polymorph/test, https://jsr.io/@polymorph/test@0.3.1) has unchanged exports and behavior; it is republished so the release rev is one commit for both JSR and cargo pins.
Still 0.x/unstable, but caret-honest: releases within a minor line stay compatible; breaking changes bump the minor.