feat(environment): add painterly skies and living meadows

assets/painterly/README.md

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+# Painterly valley assets
+
+Original broadleaf and evergreen meshes created in Blender for The Steward.
+Scalloped crowns, painted vertex variation, crooked forks and root flares replace
+the primitive tree silhouettes. Editable sources are in `art/painterly/`;
+`.gdignore` keeps Blender outside Godot's runtime import dependencies. The two
+portable GLBs use opaque geometry without textures or alpha cards.
+
+## Rebuild and mesh budget
+
+From the project root, using Blender 5.1 and Godot 4.7:
+
+```sh
+"$BLENDER_BIN" --background --python tools/art/build_painterly_trees.py
+"$GODOT_BIN" --headless --editor --path "$PWD" --import
+```
+
+Use the isolated Godot profile configured by `tools/quality.sh` for headless
+validation. Runtime consumes the GLBs directly; no mesh-extraction step is
+needed. Preserve their `.import` files when updating exports.
+
+| Geometry | Triangles | Surfaces |
+| --- | ---: | ---: |
+| Shared broadleaf crown | 1,236 | 1 |
+| Joined broadleaf trunk, forks and roots | 406 | 1 |
+| Complete broadleaf: four crowns plus trunk | 5,350 | 5 |
+| Complete conifer: boughs plus trunk | 1,580 | 2 |
+
+`tree_mesh_budget.json` records these export counts. The broadleaf GLB is
+45,676 bytes; the conifer GLB is 40,836 bytes and stands 3.10 m before placement
+scaling. A separate temporary rebuild with Blender 5.1.2 produced byte-identical
+copies of both GLBs and the budget JSON. This establishes generator
+reproducibility with that Blender version, not identical `.blend` serialization
+across versions.
+
+`StylizedTree` shares imported meshes and isolates crown tint/wind materials.
+Its four direct `Canopy*` children retain the existing thinning and stump
+presentation contract. `PainterlyConifer` shares imported bough/trunk meshes.
+Both use the same world-direction breeze and explicit painted bark colors;
+neither adds simulation state, collision or per-frame GDScript work.
+
+## Painted sky provenance
+
+`painted_sky.png` is an original 1774 × 887 image generated with the built-in
+ImageGen tool, rather than a CLI generator. The prompt asks for a painted
+cumulus panorama with warm ivory cloud tops, cool turquoise cloud shadows and
+a clear blue summer atmosphere. Film references informed the color and mood;
+no external film image was copied into the texture. The exact generation
+prompt is recorded in [sky_prompt.md](sky_prompt.md).
+
+`storybook_sky.gdshader` maps the panorama's horizon at 69% of its height onto
+the upper hemisphere, repeats the painted band twice around the azimuth to
+retain cloud proportions, blends its seam/edge into haze, and follows the existing
+day/night palette. The image supplies the sky backdrop only; it does not paint
+terrain or create volumetric clouds.
+
+Final renderer QA and the complete project quality gate belong to the
+integrated environment review. See the [presentation guide](../../docs/FEATURE_PRESENTATION_PERFORMANCE.md)
+for current verification evidence and remaining hardware limits.

assets/painterly/painted_sky.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dmkubk6dhhyis"
+path="res://.godot/imported/painted_sky.png-9888802278aff2f83effdab2649f1f05.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/painterly/painted_sky.png"
+dest_files=["res://.godot/imported/painted_sky.png-9888802278aff2f83effdab2649f1f05.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

assets/painterly/painterly_conifer.glb.import

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+[remap]
+
+importer="scene"
+importer_version=1
+type="PackedScene"
+uid="uid://clcvatvbyixma"
+path="res://.godot/imported/painterly_conifer.glb-596d48094a6a072cfc85374d478c7bbe.scn"
+
+[deps]
+
+source_file="res://assets/painterly/painterly_conifer.glb"
+dest_files=["res://.godot/imported/painterly_conifer.glb-596d48094a6a072cfc85374d478c7bbe.scn"]
+
+[params]
+
+nodes/root_type=""
+nodes/root_name=""
+nodes/root_script=null
+mesh_library/use_node_names_as_mesh_names=false
+array_mesh/deduplicate_surfaces=true
+nodes/apply_root_scale=true
+nodes/root_scale=1.0
+nodes/import_as_skeleton_bones=false
+nodes/use_name_suffixes=true
+nodes/use_node_type_suffixes=true
+meshes/ensure_tangents=true
+meshes/generate_lods=true
+meshes/create_shadow_meshes=true
+meshes/light_baking=1
+meshes/lightmap_texel_size=0.2
+meshes/force_disable_compression=false
+skins/use_named_skins=true
+animation/import=true
+animation/fps=30
+animation/trimming=false
+animation/remove_immutable_tracks=true
+animation/import_rest_as_RESET=false
+import_script/path=""
+materials/extract=0
+materials/extract_format=0
+materials/extract_path=""
+_subresources={}
+gltf/naming_version=2
+gltf/embedded_image_handling=1
+gltf/texture_map_mode=1

assets/painterly/painterly_tree.glb.import

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+[remap]
+
+importer="scene"
+importer_version=1
+type="PackedScene"
+uid="uid://blu5r5vupqvpd"
+path="res://.godot/imported/painterly_tree.glb-12cb20acdabe08bb0fe06cba12958067.scn"
+
+[deps]
+
+source_file="res://assets/painterly/painterly_tree.glb"
+dest_files=["res://.godot/imported/painterly_tree.glb-12cb20acdabe08bb0fe06cba12958067.scn"]
+
+[params]
+
+nodes/root_type=""
+nodes/root_name=""
+nodes/root_script=null
+mesh_library/use_node_names_as_mesh_names=false
+array_mesh/deduplicate_surfaces=true
+nodes/apply_root_scale=true
+nodes/root_scale=1.0
+nodes/import_as_skeleton_bones=false
+nodes/use_name_suffixes=true
+nodes/use_node_type_suffixes=true
+meshes/ensure_tangents=true
+meshes/generate_lods=true
+meshes/create_shadow_meshes=true
+meshes/light_baking=1
+meshes/lightmap_texel_size=0.2
+meshes/force_disable_compression=false
+skins/use_named_skins=true
+animation/import=true
+animation/fps=30
+animation/trimming=false
+animation/remove_immutable_tracks=true
+animation/import_rest_as_RESET=false
+import_script/path=""
+materials/extract=0
+materials/extract_format=0
+materials/extract_path=""
+_subresources={}
+gltf/naming_version=2
+gltf/embedded_image_handling=1
+gltf/texture_map_mode=1

assets/painterly/sky_prompt.md

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+# Painted sky provenance
+
+Created for this project with the built-in imagegen tool on 2026-09-05.
+Original output: 1774 × 887 PNG, copied without pixel editing to
+`assets/painterly/painted_sky.png`. The sky shader samples the upper portion
+and blends its horizon into the simulation-driven day/night palette.
+No film frame or downloaded artwork is used as a runtime texture.
+
+## Generation prompt
+
+Use case: stylized-concept. Asset type: original 360-degree panoramic sky
+texture for a Godot game, 2:1 equirectangular landscape, ideally 3072x1536.
+Create ONLY SKY, absolutely no ground, hills, buildings, ocean, objects, text
+or sun disk. Art direction: exquisitely hand-painted Japanese animation
+background, Studio Ghibli inspired summer pastoral fantasy, gouache brush
+texture, saturated clear turquoise-blue atmosphere, towering luminous cumulus
+clouds with creamy warm sunlit edges, intricate scalloped billowing forms,
+pale cyan and slate blue softly painted shadow volumes. Composition is a full
+spherical sky environment texture: upper half of image shows the upward
+hemisphere, zenith at top is mostly deep clean blue, large beautiful cumulus
+towers occupy the upper middle band between y=15% and y=44%, and the horizon
+at exactly image vertical halfway is uniform pale atmospheric aqua. Lower
+half is entirely an unobtrusive smooth pale aqua color gradient, with NO
+landscape. Cloud coverage about 40% of upper hemisphere, generous varied blue
+gaps, asymmetrical naturally spaced cloud masses. Left and right edges must
+wrap seamlessly in color and shape, keep thin strips at far left/right clear
+sky to avoid seam. No photographic cloud noise, no 3D render or vector
+outlines, no flat cartoon circles. Painterly refined layered brushwork like a
+cinematic animated film background, not a flat gradient. Use only original
+cloud shapes; no copied film imagery.
+
+The returned image does not exactly meet the requested resolution or horizon
+position. The runtime shader uses its actual dimensions and remaps the painted
+horizon at 69% image height. Blender mesh assets are deterministic rebuilds;
+this generated image is a pinned art asset, not a deterministic generator output.

assets/painterly/tree_mesh_budget.json

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+{
+  "Canopy": {
+    "triangles": 1236,
+    "surfaces": 1,
+    "vertices": 712
+  },
+  "Trunk": {
+    "triangles": 406,
+    "surfaces": 1,
+    "vertices": 221
+  },
+  "runtime_tree": {
+    "triangles": 5350,
+    "surfaces": 5,
+    "shared_meshes": 2
+  },
+  "glb_bytes": 45676,
+  "conifer": {
+    "triangles": 1580,
+    "surfaces": 2,
+    "height_m": 3.1,
+    "glb_bytes": 40836
+  }
+}