RetroAPI

Sharper tools & tags.

• Custom tools now work on vanilla blocks: beta-accurate mineable/{pickaxe,axe,shovel} and needs_{stone,iron,diamond}_tool defaults, so a plain .tool(PICKAXE).tier(IRON) item mines vanilla iron ore at iron speed, not just modded ores.
• mineable tags now grant speed only; whether a block needs a tool to drop comes from its material or a needs_<tier>_tool tag (matches modern MC). Behavior change: .mineable(...) alone no longer gates drops on a hand-breakable material.
• Multi-kind tools (.tool(PICKAXE, AXE) paxels) and dynamic runtime tier (.tier(stack -> ...)). Declared plain-item tools mine at their tier's speed. Added RetroTool.SHEARS.
• Item tags plus arbitrary runtime-mutable tags for items and blocks; reads StationAPI's tag layouts and vanilla flattening names.
• Layered sprites with no model JSON: .layers(base, overlays...) / .overlay(id).
• .facing() blocks: built-in orient-to-placer on placement, no custom enum or onPlaced.
• Ergonomics: interface injection (no RetroBlockAccess/RetroItemAccess casts) and constructor factories (RetroBlockAccess.of(Ctor::new)).
• StationAPI compatibility: clean hand-off of vanilla harvesting when StationAPI is present. See STATIONAPI_TAG_COMPAT.md.

Built and validated against StationAPI 2.0.0-alpha.6.2 for b1.7.3 (Ornithe). All features exercised by the headless populate self-check.