chore: retire ReScript guidance text → AffineScript (Estate Item 9) (#29)

Estate language policy: RS/TS/JS → AffineScript → typed-wasm. This rewrites
guidance/policy text that recommended ReScript as the TypeScript/Python
replacement so it now points at AffineScript.

Scope guard (deliberate): rescript-named paths and ReScript adapters are NOT
touched — that work is preserved intact for the ReScript ecosystem. Only the
forward-looking "use ReScript instead" recommendation is updated.

Co-authored-by: hyperpolymath <hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: hyperpolymath