test: key differential oracle cache by environment

[patlux]

Prevent stale Node differential-oracle results when unchanged program bytes observe a different inherited environment.

const production = process.env.NODE_ENV === "production";
const enabled = process.env.SCRIPTC_NEVER === "yes";

Both variables already affect output in existing corpus programs, so an environment allowlist can reuse the wrong cached verdict.

• Key Oracle results by the complete inherited environment.
• Sort and length-frame names and values so insertion order, missing entries, empty values, and delimiters remain unambiguous.
• Cover cache-key invalidation for NODE_ENV and SCRIPTC_NEVER and bump the key namespace.

Focused helper tests and a NODE_ENV differential run, lint, workspace build, and git diff --check pass. A shared-cache probe produced distinct Oracle records for both output variants of each corpus program. The full GitHub Actions matrix is pending maintainer approval for this fork PR.

[vercel]

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