docs: add release notes for vLLM race condition fix (PR #1590)

[lbliii]

Description

Adds a bug fix entry to the 26.04 release notes for PR #1590, which fixed a race condition in CaptionGenerationStage and CaptionEnhancementStage where multiple workers initializing vLLM would race on the shared torch.compile cache directory. No user-facing API changes; documentation-only.

Usage

N/A — documentation-only change.

Checklist

• I am familiar with the Contributing Guide.
• New or Existing tests cover these changes.
• The documentation is up to date with these changes.

[greptile-apps]

Greptile Summary

This is a documentation-only PR that adds a bug fix entry to the 26.04 release notes for PR #1590, which resolved a race condition in CaptionGenerationStage and CaptionEnhancementStage.

• Adds a new ### Video vLLM Setup Race Condition (PR #1590) section under the existing ## Bug Fixes heading, consistent with the structure of adjacent entries.
• The description accurately captures the root cause (multiple workers racing on the shared torch.compile cache directory), the symptom (FileNotFoundError), and the fix (moving model initialization to setup_on_node() instead of setup()).
• No API, code, or configuration changes are included; this is purely additive to the release notes.

Confidence Score: 5/5

Safe to merge — documentation-only change with no code impact.

The change is a single additive paragraph in a release notes file. The content is technically accurate, well-structured, and consistent with adjacent entries. No logic, API, or behavior is altered.

No files require special attention.

Important Files Changed

Filename	Overview
fern/versions/v26.04/pages/about/release-notes/index.mdx	Adds a new "Video vLLM Setup Race Condition (PR #1590)" entry under the Bug Fixes section; content is accurate, well-placed, and consistent with adjacent entries.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Multi-worker vLLM startup] --> B{Before fix}
    A --> C{After fix - PR #1590}

    B --> D["Each worker calls setup()"]
    D --> E["All workers race to initialize vLLM"]
    E --> F["Race on shared torch.compile cache dir"]
    F --> G["FileNotFoundError 💥"]

    C --> H["setup_on_node() runs once per node"]
    H --> I["Single initialization per node"]
    I --> J["Workers proceed safely ✅"]

    style G fill:#ff6b6b,color:#fff
    style J fill:#51cf66,color:#fff

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