feat(render): per-entity sprite_scale on the Atlas-UV path

draw_entities path-1 reads an optional sprite_scale (number, default
1.0) and applies it as uniform scaleX/scaleY in
draw_sprite_transform around the visual center. Lets templates whose
native sprite resolution (e.g. TC_Basics 300×300 bed) doesn't match
the project tile-scale (~/sporel_tile_scale.md: 64 px = 0.5 m via the
puppet shoulder anchor) render at credible real-world sizes without
re-baking the atlas.

Consumers compute their per-atlas scale from
atlas_meta.pixels_per_meter (atlas-baker v0.4.0+ output) divided into
their project canonical px/m — one line in M.init, no per-entity
constants in the template.

Unset sprite_scale preserves v0.2.0 behavior — spine-prototype,
map-editor, vagrant's pre-TC_Basics items unaffected.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

manifest.lib

@@ -1 +1 @@
-{"id":"lib-core.render","version":"0.2.0","api_min":"0.1","deps":[{"id":"lib-core.maps","version":"0.5.7"},{"id":"lib-core.composition","version":"0.3.0"}]}
+{"id":"lib-core.render","version":"0.3.0","api_min":"0.1","deps":[{"id":"lib-core.maps","version":"0.5.7"},{"id":"lib-core.composition","version":"0.3.0"}]}