Checker: numeric enum reverse reads ignore noUncheckedIndexedAccess #3557

enum E { A = 1 }
const wrong: string = E[1];

With --no-tsconfig --strict --noEmit --noUncheckedIndexedAccess case.ts, the SharpTS CLI rebuilt from main at a3683d903 exits successfully. TypeScript 6.0.3 reports TS2322 for string | undefined under --ignoreConfig --strict --noEmit --noUncheckedIndexedAccess case.ts. This happens even for a known numeric reverse key.

PR #3552 covers canonical numeric string keys in #3530. This report covers the existing number index path under the checker option. #3551 covers a missing numeric key throwing at runtime, independently of checker options.