[DOC] update for download page 2512 release [skip ci]

[nvliyuan]

update the download doc for 2512 release (same as #13984 13984)
Signed-off-by: liyuan yuali@nvidia.com

[nvliyuan]

For more details info:

• Iceberg enhancements including DML operations (delete, update, merge) for merge-on-read tables, partition transforms (year/month/day/hour/truncate), and write operations enabled by default (#13725, #13755, #13726, #13797, #13891)
• Delta Lake clustered tables DML support including update, merge, and delete operations with deletion vector enabled GPU by default [Databricks] (#13822, #13814, #13859, #13843)
• Join improvements including support for left-outer joins with no columns, new join strategies with logging and heuristic configurations, and improved gather map ordering (#13921, #13717, #13929)
• CSV support for GBK encoded data (#13754)
• Refine GpuTaskMetrics over the spill framework #13905
• Fix race condition due to premature disk handle exposure #13919

[greptile-apps]

Greptile Overview

Greptile Summary

This PR updates the documentation for the 25.12.0 release, archiving the previous 25.10.0 release and updating all version references, download links, and release notes.

Key Changes:

• Updated docs/download.md from v25.10.0 to v25.12.0 with new Maven coordinates and download URLs for all processor and Scala version combinations
• Updated release notes to highlight Iceberg DML operations, Delta Lake clustered tables support, join improvements, CSV GBK encoding support, and bug fixes
• Added complete v25.10.0 release documentation to docs/archive.md to preserve historical release information
• Maintained consistency in hardware/software requirements, signature verification instructions, and known issues documentation across both files

Confidence Score: 5/5

• This PR is safe to merge with no risk - it only updates documentation for a new release
• Documentation-only changes with systematic version updates from 25.10.0 to 25.12.0. All changes follow the established pattern: version number updates in headers, Maven coordinates, download URLs, signature verification commands, and release notes. The previous release content is properly archived. No code changes, no functional impact.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
docs/download.md	5/5	Updated version references from 25.10.0 to 25.12.0 with new release notes for Iceberg, Delta Lake, join improvements, and bug fixes
docs/archive.md	5/5	Added complete v25.10.0 release section to archive with hardware/software requirements, download links, and release notes

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Docs as Documentation Files
    participant Archive as archive.md
    participant Download as download.md
    participant Users as End Users

    Dev->>Docs: Prepare 25.12.0 release documentation
    Dev->>Download: Update version from 25.10.0 to 25.12.0
    Download->>Download: Update release header
    Download->>Download: Update Maven coordinates (x86_64 & arm64)
    Download->>Download: Update download links for all variants
    Download->>Download: Update signature verification commands
    Download->>Download: Replace release notes content
    Dev->>Archive: Archive previous 25.10.0 release
    Archive->>Archive: Add complete v25.10.0 section at top
    Archive->>Archive: Include hardware/software requirements
    Archive->>Archive: Include download table and links
    Archive->>Archive: Include release notes
    Dev->>Docs: Commit changes with [skip ci] flag
    Users->>Download: Access current 25.12.0 release info
    Users->>Archive: Access archived 25.10.0 release info

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[greptile-apps]

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[NvTimLiu]

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