chore: Mark NIXL as beta in TRTLLM

[tanmayv25]

extends from here: #3371

Summary by CodeRabbit

• Documentation
  • Reclassified NIXL from “Experimental” to “Beta” with clearer guidance.
  • Added platform note: NIXL supported on AMD64; ARM64 requires UCX.
  • Expanded setup instructions with step-by-step build/run guidance to enable NIXL, including cleaning cached wheels and using appropriate build options.
  • Updated prerequisite wording and aligned workflow descriptions while preserving existing build, container run, service start, and request steps.

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Walkthrough

Documentation in components/backends/trtllm/kv-cache-transfer.md was updated to reclassify the NIXL section as beta, clarify wording, add AMD64-only support notes (ARM64 requires UCX), and expand setup/build/run instructions including cache cleanup and NIXL-enabled builds.

Changes

Cohort / File(s)	Summary
Docs: NIXL status and setup components/backends/trtllm/kv-cache-transfer.md	Renamed “Experimental Method” to “Beta Method”; updated wording to reflect beta status; added platform constraint (AMD64 only; ARM64 needs UCX); expanded build/run instructions (wheel cache removal, NIXL-enabled build steps); retained existing workflow with augmented NIXL guidance.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

I twitch my whiskers at “beta” skies,
Cache winds shift where NIXL lies.
AMD burrows, ARM brings UCX keys,
Fresh wheels rolled with build decrees.
Hop, compile, then run—no hedge—
Sharp little edges, but steady sledge.

Pre-merge checks

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description Check	⚠️ Warning	The PR description only contains a reference to another pull request and does not follow the repository’s required template, missing the Overview, Details, Where should the reviewer start, and Related Issues sections.	Please expand the description to include the mandated headings: an Overview summarizing the change, Details of what was modified, guidance on where reviewers should begin their review, and any related issue references under a Related Issues section.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title clearly and concisely summarizes the primary change of marking NIXL as beta within the TRTLLM component, accurately reflecting the main documentation update and using common commit prefix conventions without unnecessary detail.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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Review profile: CHILL

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📥 Commits

Reviewing files that changed from the base of the PR and between 6a1391e and 2142a4b.

📒 Files selected for processing (1)

• components/backends/trtllm/kv-cache-transfer.md (2 hunks)

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