chore: Item 9 — retire ReScript guidance → AffineScript (#59)

## Estate Tech-Debt — Item 9 (ReScript→AffineScript CI-text sweep)

Rewrites guidance/policy text that recommended **ReScript** as the
TypeScript/Python replacement to recommend **AffineScript** instead, per
the
estate language policy (RS/TS/JS → AffineScript → typed-wasm).

### Scope
- ✅ In scope: "use ReScript instead" guidance, `Rust/ReScript`
migration-guide
  phrasing, `Rust or ReScript` policy text.
- ⛔ Out of scope (intentionally untouched): any `rescript`-named
path/dir and
ReScript **adapters** (e.g. proven). That work is preserved intact and
usable
for the ReScript ecosystem — only the forward-looking recommendation
changes.

Mechanical, reviewed substitution; residual in-scope occurrences
verified 0.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: hyperpolymath

.github/workflows/language-policy.yml

@@ -14,7 +14,7 @@ jobs:
           # Block new Python files (except SaltStack)
           NEW_PY=$(git diff --name-only --diff-filter=A HEAD~1 2>/dev/null | grep -E '\.py$' | grep -v 'salt' || true)
           if [ -n "$NEW_PY" ]; then
-            echo "❌ New Python files detected. Use Rust or ReScript instead."
+            echo "❌ New Python files detected. Use Rust or AffineScript instead."
             echo "$NEW_PY"
             exit 1
           fi