SDK-94: Try to fix pytest-sanity failing due to too many parallel runs and add Python 3.14 support

[benglewis]

Generated description

Below is a concise technical summary of the changes proposed in this PR:
Adjust the pytest-sanity workflow to lower the pytest_sanity matrix parallelism, add Python 3.14 coverage, and scope concurrency per runner so jobs cancel per os/python-version. Raise the SDK's dependency floors and tighten the unlearning flow's models, retry handling, and transformer pipeline tests so the Hugging Face loader path and CustomUtility targeting stay stable under Python 3.14 and the latest vulnerability fixes.

Topic	Details
Dependencies & CI	Raise dependency floors, document vulnerability rationale, and stabilize the pytest-sanity concurrency matrix so the SDK can run safely on Python 3.14 without oversubscribing runners. Modified files (4) .github/workflows/pytest-sanity.yaml VULNERABILITIES.md pyproject.toml uv.lock Latest Contributors(2) User Commit Date blewis@hirundo.io Fix Baz comment May 07, 2026 github-actions[bot] v0.2.3.post2 (#210) February 05, 2026
LLM unlearning	Clarify the unlearning flow by dropping the TargetUtility enum, defaulting utility lists to empty CustomUtility arrays, refining the SSE retryable exceptions, and expanding transformer pipeline fixtures so Hugging Face text and multimodal paths remain covered. Modified files (4) hirundo/_iter_sse_retrying.py hirundo/unlearning_llm.py tests/unlearning-llm/llm_pipeline_transformers_test.py tests/unlearning-llm/test_bias_run_info_utilities.py Latest Contributors(1) User Commit Date blewis@hirundo.io Ruff format May 07, 2026

This pull request is reviewed by Baz. Review like a pro on (Baz).

[mishana]

LGTM

[mishana]

Lgtm