Buckets, affixes, tiers, materials and crafting

Phase 4 of #147/#148. Tags on every effect; the damage and defence buckets of docs/builds.md § 4.3 (add inside, multiply across); affixes on Hands (offence), Arms (tempo) and Legs (defence), the second one chosen by the crafter; five tiers where magnitudes scale ×1..×5 and rates never (a complete T5 build beats ten complete T1 builds, #149) (§ 12); materials only open their tier; recipes per discipline incl. Tinkering for jewellery; designs learnt once.

Done when every discipline crafts T1–T5; tooltips and the loadout show the buckets; the economy simulation (#127) runs with the new recipes.

Stream C (2026-10-26): tiers, materials, recipes, designs and the new goods are built (docs/builds-implementation.md § 3.7): every build item crafts at T1–T5 from its tier's materials, designs are learnt from scrolls and chosen at craft time, exceptional pieces take the crafter's second affix, every material has a source. Left: the loadout and craft window choosing designs and affixes (stream U), elites and bosses dropping designs by kind (stream E), socketing runes (stream J), the economy simulation tuned for the new goods.