`convert` and `run --export` always fitted the model-space extents, so
`zoom`, `pan` or `view.set` in a run had no effect on the image and there
was no way to export a region.
- io: `write_framed(d, name, window)` frames PNG, SVG and PDF on a
model-space rectangle (fitted without margin, centred, no distortion);
`write` is unchanged and still fits the extents. `check_window` rejects
non-finite, inverted, zero-size and out-of-range (±1e12) windows.
- CLI: `run --export` shows the current view when the commands changed
it, otherwise the extents as before. `--window x0,y0,x1,y1` and
`--view extents|current` on `convert` and `run` choose the framing
explicitly. The usage text and README say how images are framed.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Valentin KleinandClaude Opus 5.5
396b098d9a