Add Singularity R91 Wan I2V cascade continuation node

[DIIIUA]

Summary

• Add/update the Singularity custom node listing.
• Current listing text points to the R91 public stabilization release.
• R91 stabilizes the modern ComfyUI Desktop UI, cleans the public defaults, preserves the native upload button, and documents Strategy Control Surface diagnostics while keeping experimental math neutral by default.

Validation

• python -m json.tool custom-node-list.json

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