docs(governance): address PR #169 review — reconcile sprite-era decisions + doc fixes

Tyre: D-244 now references its precedent (D-148 3D camera / D-149 live 3D characters
— D-244 completes that pivot for objects + assets) and reconciles the 5 sprite-era
decisions it touched, all amended 2026-06-17:
- D-043: 'not 3D' / Light2D scoped to overlay layers; in-world is 3D.
- D-044: sprite footprint retired (sim occupancy + visual hierarchy survive).
- D-049: z-stack logical model survives; sprite/CanvasLayer implementation language retired.
- D-066: dual-scale coordinate model + 2x2 geometry minimum survive; sprite-footprint language legacy.

Hoshe (doc QA):
- D-244 broken cross-file anchors fixed ([D-159]->scope.md, [D-241]->process.md).
- renderer/README: bare [D-244] linked; D-019->D-148 camera note; legacy banner over the
  object-sprite workflow sections; resolution-chain output path qualified.
- docs/assets/_templates/sprite.md + README: marked the template legacy object-sprite schema
  (model/texture/artwork template TBD).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/assets/README.md

@@ -24,7 +24,7 @@ docs/assets/
   README.md              # This file — master index
   _templates/
     audio.md             # Row template + detailed entry template for audio
-    sprite.md            # Row template for 2D artwork rows (paintings/flags/billboards — see /sprite-gen)
+    sprite.md            # LEGACY object-sprite row template (D-244 retired sprites; model/texture/artwork template TBD)
     video.md             # Row template + detailed entry template for video
   audio/
     README.md            # Audio pipeline index — categories, status summary

docs/assets/_templates/sprite.md

@@ -7,6 +7,8 @@ status: active
 
 # Sprite Asset Template
 
+> **Legacy (D-244).** This is the retired **object-sprite** row schema (4-direction, resolution variants). Per [D-244](../../../governance/decisions/architecture.md#d-244-asset-rendering--3d-objects-in-world-2d-limited-to-textures--flat-artwork), game objects are 3D (not sprites) and the only flat 2D content is textures + artwork — so a model / texture / artwork row template is TBD (tracked with the visual-catalog re-scope, T-961/T-1049/T-1050). This schema is kept for reference and for the 2D-artwork (paintings/flags/billboards) use of `/sprite-gen`.
+
 ## Table Row Format
 
 ```