docs: drop macOS Intel (x86_64) from supported client platforms

[kheiss-uwzoo]

Summary

• Update the Pre-Requisites & Support Matrix platform summary and Software Requirements to state that macOS Intel (x86_64) is not supported for PyPI installs (Ray >=2.56.1 has no Intel Mac wheels), while Apple Silicon (arm64) remains supported for slim remote/NIM-only installs alongside Windows x64.
• Align the package README Remote NIM install line with the same platform set.

Context

Team decision (Slack): abandon Intel Mac support so Ray can move to 2.56+ for CVE remediation. Eng change is in #2440 (removes macos-26-intel CI and bumps Ray). Randy asked for changelog + install-guide notes. Changelog language is in draft #2434.

Merge coordination

• Prefer merge after or with Fix CVE pkgs #2440 so docs match main dependency reality.
• Related changelog: draft docs(extraction): add 26.08 release notes for post-26.05 changes #2434

Test plan

• Confirm wording matches Fix CVE pkgs #2440 Ray pin and CI matrix (arm64 only on macOS)
• Spot-check support matrix Platform summary + Software Requirements
• Spot-check README Remote NIM bullet
• No remaining "macOS x64/ARM64" or unqualified macOS support claims in these two files

[greptile-apps]

Greptile Summary

The PR consistently documents that PyPI installs support Apple Silicon but not Intel macOS because current Ray releases provide no Intel Mac wheels.

• Qualifies macOS support in the getting-started guide.
• Updates the support matrix and software requirements.
• Aligns the package README’s Remote NIM platform guidance.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
docs/docs/extraction/getting-started-about.md	The platform overview now limits supported macOS remote-NIM installations to Apple Silicon, resolving the previous unqualified support claim.
docs/docs/extraction/prerequisites-support-matrix.md	The support matrix now consistently excludes Intel macOS and explains the Ray wheel constraint.
nemo_retriever/README.md	The Remote NIM quick-start guidance now identifies Apple Silicon as the supported macOS architecture.

_{Reviews (2): Last reviewed commit: "docs: restrict getting-started macOS cla..." | Re-trigger Greptile}