FEAT: Add Dart, Perl, and Raku package hallucination techniques

[Yusef Syed (YusefSyed)]

Description

Closes #2531.

This extends the existing garak.package_hallucination scenario with Dart, Perl, and Raku while reusing PyRIT's registered Garak package datasets and PackageHallucinationScorer support.

• add Dart, Perl, and Raku technique/spec wiring to the existing scenario
• bump the scenario version from 2 to 3 for the expanded technique contract
• keep Rust as the only default technique and the only package registry preloaded by the default dataset configuration
• retain on-demand registry fetching for every non-default technique
• extend scenario tests for all seven techniques, each scorer ecosystem, all six non-default lazy-fetch paths, and the unchanged Rust default
• update the synchronized Garak scanner .py and .ipynb documentation

No dataset loader, scorer, or default-loading behavior is added or duplicated.

AI assistance disclosure: AI tools assisted with repository search, implementation drafting, and a separate fresh-context review. I directed the work, reviewed the final four-file diff, verified the existing dataset/scorer contracts and upstream Garak language labels, removed unrelated generated lockfile churn, and ran the checks below.

Tests and Documentation

• uv run --frozen pytest tests/unit/scenario/garak/test_package_hallucination.py -q — 31 passed
• uv run --frozen pytest tests/unit/scenario/garak/test_package_hallucination.py tests/unit/score/test_package_hallucination_scorer.py tests/unit/datasets/test_garak_package_hallucination_dataset.py tests/unit/docs/test_scenario_documentation.py -q — 79 passed
• uv run --frozen -m pytest -n 4 --dist=loadfile tests/unit — 17,067 passed, 10 skipped
• uv run --frozen pre-commit run --files pyrit/scenario/scenarios/garak/package_hallucination.py tests/unit/scenario/garak/test_package_hallucination.py doc/scanner/garak.py doc/scanner/garak.ipynb — all hooks passed, including Ruff, ty, documentation validation, notebook checks, and async-suffix validation
• Jupytext logical-content comparison between doc/scanner/garak.py and doc/scanner/garak.ipynb — synchronized; conversion differed only in the locally installed Jupytext version metadata (1.19.4 vs 1.19.5)

The full unit run reported 17 existing dependency/deprecation warnings. No live model target or external registry download was used; the focused tests mock registry fetching and exercise the provider-free scenario wiring.

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