Prepare Newton 1.6.0rc1

[eric-heiden]

Description

Prepare release-1.6 for Newton 1.6.0rc1 from branch point 9595fe4e3bc177e7870683316af4eb18e59d1b9a.

• Set project metadata to 1.6.0rc1.
• Regenerate the public API version reference and uv.lock.
• Resolve warp-lang==1.17.0 from public PyPI.
• Remove the NVIDIA package index from release and ASV installs.

PR #4101 is intentionally excluded from this release candidate by maintainer decision.

Checklist

• New or existing tests cover these changes (release metadata/configuration only)
• The documentation is up to date with these changes
• For user-facing changes, a fragment has been added (not applicable; release metadata only)

Test plan

• uv run docs/generate_api.py
• uv lock --check
• uv run --extra dev python -m unittest newton.tests.test_generate_api
• uvx pre-commit run -a
• uv build --out-dir <temporary-directory>
• Clean isolated Python 3.12 wheel installation

All checks passed. The source distribution and wheel are named for 1.6.0rc1. The isolated installation reports 1.6.0rc1 from package metadata and newton.__version__, and imports Newton from isolated site-packages.

PyPI has no newton==1.6.0rc1 release and v1.6.0rc1 was unused locally and on the canonical remote before this PR was opened. Both will be checked again immediately before tagging.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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