Curator pip install: Transformers version conflict: nemo_toolkit[asr] requires transformers<4.55 vllm requires transformers>=4.55

Describe the bug

ALL Extras - Install Only (pip) - Py3.12 / Py3.10
Root causes:
Transformers version conflict:
nemo_toolkit[asr] requires transformers<4.55
vllm requires transformers>=4.55
These are mutually exclusive - pip can't resolve this
flash-attn build issues:
Requires packaging module at build time
Requires torch pre-installed at build time

Why uv works but pip doesn't
uv uses a lockfile (uv.lock) that:
Pre-resolves all dependencies
Uses override-dependencies in pyproject.toml to force transformers>=4.55.2
Has no-build-isolation-package = ["flash-attn"] so torch is available during build
pip doesn't have these mechanisms - it tries to resolve on-the-fly and can't handle build-time dependencies or forced overrides.

Expected behavior

Expected Pip to install without issue

Additional context

Add any other context about the problem here.

Start with pyproject.toml and uv.lock, then inspect the dependency declarations for nemo_toolkit[asr], vllm, transformers, and flash-attn. Reproduce the pip installation on Python 3.10 and 3.12, including the all extras, and compare it with the documented uv setup. Done means pip resolves the dependencies and completes the flash-attn build without the reported conflict or missing build requirements.