Restore requested dimensions when CPU snapshot graphics initializes

[r-barton]

CPU snapshots can ignore video_res_width and video_res_height: a session requesting 320×240 currently receives 1280×720 because older engines replace the connection dimensions while graphics is disabled.

After enabling CPU graphics, restore the requested canvas dimensions before applying graphics settings and camera framing. Repeat this whenever graphics is initialized, since native snapshots disable graphics again after capture. Omitted or zero axes use the existing engine defaults.

The rebuilt Python bindings returned the requested 320×240, 1024×1024, and 1600×900 images against the dev CPU engine. Each size was captured twice in the same session to exercise graphics teardown and restart.

Companion fixes:

• https://github.com/KittyCAD/engine/pull/5338 preserves the dimensions at engine initialization.
• Restore requested snapshot dimensions in CPU sessions mcp#312 applies the same compatibility fix to persistent MCP sessions.

Related CPU-only rollout: https://github.com/KittyCAD/text-to-cad/pull/4465.

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Project	Deployment	Actions	Updated
modeling-app	Ready	Preview	Oct 16, 2026 2:44pm UTC

[codspeed]

Merging this PR will not alter performance

✅ 157 untouched benchmarks
⏩ 131 skipped benchmarks¹

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_{Comparing ryan/cpu-snapshot-dimensions (ad52a2e) with main (830649d)}

Footnotes

1. 131 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩