Upgrade to Nemotron RC NIMs and NV-Ingest 26.1.2

[smasurekar]

Upgrade to Nemotron RC NIMs and NV-Ingest 26.1.2

Summary

• NIMs: Switched from nemoretriever to nemotron; release candidate (RC) images are used.
• NV Ingest: Upgraded to 26.1.2 (from 26.1.1).
• ⚠️ Cloud endpoints: Not available for these new models yet. Flows using NVIDIA-hosted (cloud) endpoints for embedding, reranker, page-elements, graphic-elements and table-structure will fail until the models are GA; they will work once generally available, with no further blueprint changes.
• nvdev.env: Unchanged - new models are not on nvdev. nvdev.env is kept unchanged for CI to pass.
• Nemotron OCR: Not included; has known issues. Will be added in a follow-up once resolved.

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NIM / model changes

Component	Before model name	After model name
Embedding	nvidia/llama-3.2-nv-embedqa-1b-v2	nvidia/llama-nemotron-embed-1b-v2
Reranker	nvidia/llama-3.2-nv-rerankqa-1b-v2	nvidia/llama-nemotron-rerank-1b-v2
Vision / layout	nemoretriever-page-elements-v3, nemoretriever-graphic-elements-v1, nemoretriever-table-structure-v1	nemotron-page-elements-v3, nemotron-graphic-elements-v1, nemotron-table-structure-v1

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