Consolidate several external-identity canonicalization gaps found while reviewing the `node:<mod>` work: - `typesVersions` redirect dirs are not normalized: `@types/node/ts4.8/fs.d.ts` canonicalizes to `node:ts4.8/fs` instead of `node:fs`. - `@types/node/globals.d.ts` yields a non-specifier `node:globals` rather than a real module specifier. - an unprefixed `"fs"` fallback and the checker's `node:fs` produce split identities for the same module. - no test covers the checker-path bare default-import call shape. Found in the 1.0.0 final review.