docs(troubleshoot): replace stale embedding batch-size and Triton log guidance (NVBug 6628722)

[kheiss-uwzoo]

Summary

• NVBug 6628722: replace the no-op EMBEDDER_BATCH_SIZE embedding-startup workaround with image-specific NIM env vars for Helm 2.3.0 (NIM_PIPELINE_MAX_BATCH_SIZE) and development Compose 1.12.0 (NIM_TRITON_MAX_BATCH_SIZE).
• Clarify that CLI --embed-batch-size and .embed(inference_batch_size=...) do not start the NIM.
• Reframe the Triton INFO-as-ERROR section as NIM-container log noise (
  imutils.py is inside the NIM image, not NRL source) and keep the ignore-as-info action.

Test plan

• Confirmed EMBEDDER_BATCH_SIZE is not read in NRL source, CLI, SDK, Helm, or Compose.
• Confirmed Helm default VL embed image is llama-nemotron-embed-vl-1b-v2:2.3.0 and Compose default tag is 1.12.0.
• Confirmed
  imutils.py is not in the NRL repository.
• QA: reproduce the embedding-NIM startup error on RTX 6000 (or equivalent) and recover with the documented NIM env var for that image.
• QA: confirm Triton INFO lines wrapped as ERROR can still be ignored.

pre-draft: leakage, mkdocs --strict, ::a, ::p, ::r on the diff vs main

Base: upstream/main
Files: docs/docs/extraction/troubleshoot.md

Check	Result
Leakage (page roles + see [ CTAs)	PASS — troubleshoot.md has no see [ CTAs; conceptual-page greps are not applicable to this file
Allowed paths	PASS — 1 documentation file
mkdocs --strict	FAIL — exit 1; 4 warnings on untracked leftover pages custom-metadata.md and user-defined-stages.md that are not in this diff; troubleshoot.md had no warnings
::a audit	PASS — EMBEDDER_BATCH_SIZE unused (repo grep); Helm 2.3.0 uses NIM_PIPELINE_MAX_BATCH_SIZE; Compose 1.12.0 uses NIM_TRITON_MAX_BATCH_SIZE;
imutils.py not in NRL (95%)
::p polish	Applied — deployment-mode recovery, complete-sentence code examples, shortened Triton log dump
::r style	95% — no blocking issues in the changed sections

Code drift (not in this docs PR):
emo_retriever/helm/values.yaml still sets NIM_TRITON_LOG_VERBOSE=1 on
imOperator.vlm_embed. Embedding NIM 2.3.0 removes that variable with no replacement.

PR: this draft