cli: snapshot draws a script's model to a PNG with no window

fieldcraft-cli snapshot script.json --out shot.png [--view] [--size WxH]
draws the engine's framed scene (engine::view::frame, shared with the CPU
render_png) with the viewport's GPU pipelines offscreen: hardware GPU, then
a software one, then the CPU rasterizer (FIELDCRAFT_GPU=auto|hardware|
software|cpu). CI installs lavapipe so the GPU path runs there.

Refs #422

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-15 20:19:00 -04:00
1 parent 248e74ca9e
commit fee978c7e4
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@@ -118,6 +118,7 @@ cargo xtask ci # fmt, assets, layers, clippy, t
cargo xtask test --heavy # the heavy (ignored) tests and the doc tests
cargo run -p fieldcraft-cli -- commands # every command and its parameters
cargo run -p fieldcraft-cli -- run script.json # run a command script
cargo run -p fieldcraft-cli -- snapshot script.json --out shot.png # draw it to a PNG, no window
cargo run -p fieldcraft-cli -- mcp # MCP server on stdio for AI agents (docs/mcp.md)
```