feat: introduce identity-backed goat

docs/baselines/JAJCE_GOAT_07.md

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+# Jajce Goat 07
+
+Captured 2026-07-26 with the Metal renderer from the same close-up camera:
+
+- [hungry frame](jajce_goat_07_hungry.png)
+- [content frame](jajce_goat_07_content.png)
+
+Only authoritative hunger changes between the paired frames. Dunja lowers her
+head toward the bowl and shows a small amber empty-bowl cue while hungry; after
+feeding she raises her head and the persistent cue clears. The brief green
+response is deliberately transient and is not part of the restored frame.
+
+This visual comparison sits on the gameplay proof:
+
+- Dunja has one stable animal ID and is not a resource node;
+- NPC and player use the same exact feed operation;
+- one feed withdraws one real pantry food and relieves only Dunja;
+- world-schema v10 restores position, hunger, and last-fed tick without
+  replaying presentation effects.
+
+The next animal frame should prove a real pasture/shelter movement routine,
+not multiply static livestock.
+
+Capture command:
+
+```bash
+HOME="$PWD/logs/quality/godot_profile" \
+APPDATA="$PWD/logs/quality/godot_profile" \
+LOCALAPPDATA="$PWD/logs/quality/godot_profile" \
+/Applications/Godot.app/Contents/MacOS/Godot \
+  --path "$PWD" --script res://tools/capture_jajce_lookdev.gd -- \
+  --scene=res://world/jajce/JajceGoatLookdev.tscn \
+  --hide-debug-labels --animal-hunger=goat_dunja:90 \
+  --output=res://docs/baselines/jajce_goat_07_hungry.png
+```
+
+For the content frame, change the hunger override to `20` and the output
+filename to `jajce_goat_07_content.png`.