fix(evaluator): add missing UriBuiltins import - #188

main currently does not compile:

BuiltinRegistry.java:42: error: cannot find symbol
      UriBuiltins.class,
  symbol: class UriBuiltins

BUILTIN_CLASSES references UriBuiltins, which lives in the impls subpackage and so needs an explicit import. This adds it — one line, no behaviour change.

How it slipped in

Two individually green PRs that break in combination:

• Implement uri.parse and uri.is_valid builtins #156 branched from a commit where BuiltinRegistry still had import ...ast.builtin.impls.*;, so its one-line + UriBuiltins.class, compiled there.
• fix: expand wildcard imports (AvoidStarImport, 79 violations) #171 then replaced that wildcard with explicit imports.

The merge had no textual conflict, so the reference survived without an import. pull-request.yml is on: pull_request only and no workflow builds main on push, so nothing flagged it — it surfaces on unrelated PRs instead (e.g. #187).

Worth considering separately: adding push: branches: [main] to the build workflow so a red main is caught directly.

Testing

./gradlew build passes on this branch (compile, Checkstyle, PMD, all module tests). Verified main at 6f5e5dc fails the same way without this change.