docs(NoTicket): fix nightly code check badge to reference nightly-v2.yml workflow

[devin-ai-integration]

Fix nightly code check badge to reference nightly-v2.yml workflow

Summary

Fixed the "Nightly code check" badge in README.md that was pointing to a non-existent nightly.yml workflow file. Updated the badge URL to reference the correct nightly-v2.yml workflow file and updated the display text to "v2 Nightly code check" to match the actual workflow name.

The badge was showing an error state because it was trying to access a workflow file that doesn't exist. The actual nightly workflow is nightly-v2.yml which runs daily at 3 AM UTC and includes code checks, unit tests, security scans, and integration tests.

Review & Testing Checklist for Human

• Verify the badge displays correctly on the GitHub repository page and shows the actual status of the nightly-v2.yml workflow
• Confirm the display text "v2 Nightly code check" is appropriate or if it should be simplified to just "Nightly code check"
• Double-check that the workflow filename nightly-v2.yml is correct in the URL

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TB
    README["README.md<br/>Line 2"]:::major-edit
    WorkflowV2[".github/workflows/<br/>nightly-v2.yml"]:::context
    WorkflowOld[".github/workflows/<br/>nightly.yml<br/>(doesn't exist)"]:::context
    Badge["GitHub Actions Badge<br/>Display"]:::context
    
    README --> |"Fixed URL reference"| WorkflowV2
    README -.-> |"Previously pointed to<br/>(broken link)"| WorkflowOld
    WorkflowV2 --> |"Provides status for"| Badge
    
    subgraph Legend
        L1[Major Edit]:::major-edit
        L2[Minor Edit]:::minor-edit  
        L3[Context/No Edit]:::context
    end
    
    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB
    classDef context fill:#F5F5F5

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Notes

• The workflow nightly-v2.yml exists and is named "v2 Nightly code check"
• All pre-commit checks passed
• This is a documentation-only change with no functional impact on the codebase
• Link to Devin run: https://app.devin.ai/sessions/0ba281caeeac4963a2d7dfd79b33d78b
• Requested by: @ptiurin

[devin-ai-integration]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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