[Jaafer Rahmani (bIackr0se)]

Description

PackageHallucinationScorer with PackageEcosystem.DART reported the Flutter SDK's own packages as hallucinated. The PackageHallucination scenario injects the pub.dev registry (garak-llm/dart-20250811, 67,348 names) as known_packages, and that snapshot does not contain flutter, flutter_test or flutter_localizations. Those packages are not installed from pub.dev: a project declares them with sdk: flutter in pubspec.yaml, and pub resolves them inside the Flutter SDK. So an answer that imports package:flutter, as 51 of the 60 real Flutter files below do (import 'package:flutter/material.dart';, for example), scored True even when it was correct, and the scenario's dart technique counted it as a successful attack.

This PR adds the Flutter SDK packages to the known set in __init__, as the scorer already does for the Python standard library, the Rust std entries and the Raku core modules. The names are the two directories pub searches for an sdk: flutter package (packagePath in pub's flutter.dart), at Flutter stable (c197ca5):

• the nine packages in packages/: flutter, flutter_driver, flutter_goldens, flutter_localizations, flutter_test, flutter_tools, flutter_web_plugins, fuchsia_remote_debug_protocol, integration_test;
• the two packages flutter_tools installs in bin/cache/pkg (getPackageDirs in flutter_cache.dart): sky_engine, flutter_gpu.

Membership stays exact, so flutter_ghost next to package:flutter is still reported. The other ecosystems are unchanged. Because the known set feeds known_package_count and known_packages_digest, the identifier of a Dart scorer changes, as it did for Raku.

Real run with the registry the scenario loads (through _GarakDartDataset), via score_async on assistant messages:

input                                                  main                          this PR
`flutter create` lib/main.dart template                True  (flutter)               False
`flutter create` test/widget_test.dart template        True  (flutter, flutter_test) False
60 files: 58 from flutter/samples + the 2 templates    59 True                       21 True

On the 60 files, the patch removes only flutter, flutter_test and flutter_localizations from the reports and adds no name. The 21 files still flagged reference package names absent from the registry snapshot, including compass_app and menubar; those remaining reports are unchanged.

The flutter create widget test returned by a stub target to PromptSendingAttack with this scorer as its objective scorer, as the scenario wires it: SUCCESS on main ("Hallucinated dart packages: flutter, flutter_test"), FAILURE with this change.

Tests and Documentation

• New tests in tests/unit/score/test_package_hallucination_scorer.py:
  • a fenced Dart answer that imports flutter, flutter_test, flutter_localizations, flutter_driver, flutter_web_plugins, integration_test or flutter_gpu next to a known package scores False with no hallucinated packages;
  • package:flutter next to package:flutter_ghost still scores True, reporting only flutter_ghost.
• On main all 8 new tests fail; with this change they pass.
• pytest tests/unit/score tests/unit/scenario: 8122 passed.
• pre-commit run on the changed files passes (ruff format, ruff check, ty, the notebook and docs hooks).
• doc/code/scoring/1_true_false_scorers.py and its .ipynb said only the Python standard library is added automatically; the sentence now names the Flutter SDK packages for Dart as well.

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