wyj 2a0197229a Feat: Write mesh overlay as a separate <stem>_mesh image ...

--draw-mesh no longer modifies the primary render.  The clean HDR FITS and
tone-mapped image are written first, then the final image-plane mesh is
overlaid in place on the already-consumed HDR buffer and saved as a
<stem>_mesh sibling.  This applies uniformly to single-frame, movie-frame,
and imported lens-map renders, with derived paths validated before catalog,
spacetime, and render initialization.

Dummy PSF backends still write nothing and report ignoring --draw-mesh.  The
reference-image target now uses the configured image extension so the
ENABLE_PNG=0 test path passes, and the CLI tests cover clean-main identity,
sibling naming, PATH_MAX overflow, and zero-tolerance HDR comparison.

README, README.zh-CN, and usage.md describe the new naming; the mesh reference
asset is renamed to match.

2026-09-26 17:01:25 -04:00

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