fix: resolve 7 medium-priority bugs from audit #372

- #371: Replace Math.random() with seeded PRNG in getSpireEnemyArmor/Barrier
- #370: Add mana refund when cancelling pact ritual in cancelPactRitual
- #367: Add ENCHANT_MASTERY check for design slot 2 in crafting store
- #364: Fix useGameDerived to read crafting data from useCraftingStore
- #363: Clamp recovery room regen delta to prevent negative mana loss
- #365: Add shield/barrier/healthRegen fields to all procedural guardians
- #362: Refactor enchanting tick pipeline to return writes instead of direct store calls

Extracted procedural guardian generators into guardian-procedural.ts to stay under 400-line limit.

All 1158 tests pass.

docs/project-structure.txt

@@ -356,6 +356,7 @@ Mana-Loop/
 │   │   │   │   ├── fabricator-wizard-recipes.ts
 │   │   │   │   ├── guardian-data.ts
 │   │   │   │   ├── guardian-encounters.ts
+│   │   │   │   ├── guardian-procedural.ts
 │   │   │   │   └── loot-drops.ts
 │   │   │   ├── effects/
 │   │   │   │   ├── discipline-effects.ts