fix: restage png-exr-alpha hero into dark studio house style

[TMHSDigital]

Summary

• Restage-only: framed easels on a dark table, dim AREA key/fill/rim/wedge, faint emission so white clamps stay legible without washing the stage.
• Check code, README, and gallery card copy unchanged.
• Contact sheet committed at docs/gallery/contact-sheets/png-exr-alpha-restage.webp (armature-bend | candidate | damped-track-aim | bmesh-gear).

Contact sheet

https://github.com/TMHSDigital/Blender-Developer-Tools/blob/fix/png-exr-alpha-studio-restage/docs/gallery/contact-sheets/png-exr-alpha-restage.webp

Raw: https://raw.githubusercontent.com/TMHSDigital/Blender-Developer-Tools/fix/png-exr-alpha-studio-restage/docs/gallery/contact-sheets/png-exr-alpha-restage.webp

Per-criterion verdict (candidate vs armature-bend / damped-track-aim / bmesh-gear)

Criterion	Verdict
Stage darkness	Pass — contact-cell mean luminance 69.7 vs armature 71.1 / gear 77.7 (not the brightest)
Wedge warmth	Pass — warm AREA wedge on far wall; table reads as deliberate base
Subject fill	Pass — dual easels ~70% frame with dark surround
Saturation	Pass — primaries intact; white clamps remain the bright evidence
Thumbnail legibility	Pass — mangled vs clean readable at 320×180
Odd-one-out?	No — sortable with the calibration set by stage, not by subject brightness

Test plan

• Check-only Blender 5.1.1 local (measured values unchanged)
• Blender 4.5 via CI smoke (4.5 not local; 4.4 not a substitute)
• python scripts/build_gallery.py; inspected generated alt (no dups) + detail page
• validate / manifest / drift / 4.5+5.1 smoke on PR

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