feat: derive resource visuals from state

docs/baselines/JAJCE_RESOURCE_STATES_05.md

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+# Jajce Resource States 05
+
+Captured: 2026-07-17
+
+## Files
+
+- [full resources](jajce_resource_states_05_full.png)
+- [low resources](jajce_resource_states_05_low.png)
+- [depleted resources](jajce_resource_states_05_depleted.png)
+- `world/resource_nodes/ResourceAmountVisual.gd`
+- `world/jajce/HarvestableTreePresentation.tscn`
+- `tests/jajce_resource_presentation_state_test.gd`
+
+The three images use the same 1280×720 cross-river camera, daylight value,
+warmup, and Metal renderer. Debug labels are hidden. The lower-left berry patch
+and right-hand harvestable tree are shown at their authored full amounts, at
+40%/50% respectively, and at zero.
+
+## Amount-derived visual language
+
+`ResourceAmountVisual` finds its owning `ResourceNode` and derives one of three
+tiers from `amount_remaining / initial_amount`:
+
+- full keeps all five berry leaf clumps, eight berries, and four tree canopies;
+- low keeps three leaf clumps, four berries, and two tree canopies; and
+- depleted keeps a two-leaf fruitless remnant and replaces the tree with a
+  low-poly stump and warm cut face.
+
+The threshold is deliberately simple and readable: a positive source at or
+below half amount is low. The berry keeps using two bounded MultiMeshes, so
+thinning changes only `visible_instance_count`; it does not create or destroy
+nodes during play. The tree wrapper reuses the existing wind-reactive standing
+tree and toggles authored crown/stump parts.
+
+## Authority and restore proof
+
+`ResourceStateRecord` remains the only amount authority. `ResourceNode` now
+emits its existing `amount_changed` presentation signal when authoritative
+state is rebound, including restore. The visual contract listens to that signal
+and also refreshes once after scene readiness, covering either bind order.
+
+The focused scenario performs two real player harvests on
+`berry_bush_river_02` and two real NPC gather completions on
+`tree_river_resource_01`, checks the low presentation and NPC wood inventory,
+then fully depletes both through those same production paths. It restores low
+and depleted snapshots in turn and verifies the presentation is reconstructed.
+The resource records contain no visual, visibility, tier, or stump fields.
+
+The capture tool's optional amount overrides also construct and bind ordinary
+`ResourceStateRecord`s. They do not directly manipulate visual children, so
+the review images exercise the same runtime contract as gameplay.
+
+## Next slice
+
+Apply this contract to the existing `tree_forest_grove_01` and
+`tree_forest_grove_02` stable IDs in one bounded forest-edge cluster. Decorative
+canopy and understory should stay presentation-only while the two finite trees
+remain reachable, discoverable, depletable, and restore correctly.
+
+## Capture commands
+
+```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/JajceResourceStateLookdev.tscn \
+  --output=res://docs/baselines/jajce_resource_states_05_full.png \
+  --hide-resource-labels
+```
+
+For the low frame, append:
+
+```text
+--resource-amount=berry_bush_river_02:2
+--resource-amount=tree_river_resource_01:4
+```
+
+For the depleted frame, use the same arguments with both amounts set to `0`.

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