Expedition Core

v0.0.0-beta.2 - Structures & BossEncounter framework (M1)

First real milestone of Expedition Core: jigsaw structure helpers and a phased boss-encounter state machine.

Added

• Structures: JigsawUtils (build/register StructureTemplatePools), StructurePlacement (spacing/separation), PieceSpawn (controlled piece-spawn callbacks).
• Boss encounters: BossEncounter — a data-attachment-backed state machine with a builder API (phases, arena lock, boss bar, loot, music), plus a GeckoLib render base (GeoBossEntity/GeoBossRenderer).
• Loot: LootInjector (pool injection gated by a datapack-load-time condition), AdvancementHooks.
• Config: server-side multiplayer boss health/damage scaling and arena-escape grace period.

Fixed

• BossEncounter's phase tracking had an off-by-one that made the highest-threshold phase (e.g. entering combat at 75% health) unreachable — fixed.
• LootInjector's pool condition was accepted but never evaluated (the wrong condition type for the event it fires on) — switched to the correct load-time condition type.

Library mod, ships no content by itself. Install it because another mod (starting with Majestic) requires it. The dimension bootstrap framework doesn't exist yet — that's Milestone 2.