Replace flat-black unexplored fog with an antique-cartography treatment
(Civ-VI style), themed as dwarven 'unmapped vellum/slate' — reveals no
real terrain, only a stylized stone surface.
- fog_renderer.gd: unexplored tiles painted with a procedurally generated
opaque vellum texture (FastNoiseLite domain-warped FBM → warm dark
slate→parchment gradient), generated synchronously at init so there is
no reveal-before-ready leak. No binary art asset required. Visible/seen
paths unchanged; frontier stays a clean opaque edge.
- design-tokens.json -> ui_theme.tres: fog.unexplored 000000ff -> 1a160fff
(warm 'unmapped vellum' tone) so the minimap unexplored cover matches.
Render-verified on apricot (iter_7q proof, fog enabled): undiscovered
renders as warm stone/vellum on map + minimap, no terrain bleed, clean
frontier, lit tiles unaffected. gdlint clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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