feat: add stature potions and tiny-player launchers

2026-09-04 11:28:24 -04:00
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+---
+type: User Story
+title: "US-002: Make precise stature adjustments"
+description: Let players craft upgraded potions that increase or decrease scale by one configured step.
+status: done
+---
+
+# US-002: Make precise stature adjustments
+
+As a **player**, I want more expensive growth and diminution potions so that I can adjust my stature predictably.
+
+## Acceptance criteria
+
+- [x] The Potion of Growth uses `GAG/ASA/GRG`, where `G` is Gold Ingot, `A` is Amethyst Shard, `S` is an authenticated Potion of Shifting Stature, and `R` is Rabbit's Foot.
+- [x] The Potion of Diminution uses `GAG/ASA/GFG`, where `F` is Fermented Spider Eye.
+- [x] Each resulting potion has distinct persistent metadata.
+- [x] Growth adds one configured adjustment step and clamps at the maximum.
+- [x] Diminution subtracts one configured adjustment step and clamps at the minimum.
+- [x] Adjusted scales are reported and persisted under the same rules as random stature.
+- [x] Automated tests cover adjustment, clamping, and potion identity.
+
+## Related
+
+- [US-001: Drink a Potion of Shifting Stature](us-001-drink-shifting-stature-potion.md)