0.9.0

Particles

Add registered particle sprite types and reusable burst/emitter effects, with custom PNGs, Minecraft atlas cells, independent animation, color/alpha, rotation, size, motion, and collision policies.
Add optional per-instance Lua onTick updates with scoped particle controls and transient memory.
Default to admitting up to 1,024 new custom particles per client tick; configurable with particles.maxPerTick.
Allow client-wide particle budgets up to 65,535 active or new sprites per tick, retaining defaults of 4,096 active and 1,024 new sprites per tick.
Extend world particle spawning with custom references/keys and add effect handles, actor attachments, client budgets, diagnostics, and owner/world cleanup.

Define multiblocks in Lua with layers or sparse positions, block/state rules, count constraints, horizontal orientation, optional mirrors, repeatable layers, and named groups of matching positions.
Add controllerless discovery, automatic/item activation, explicit deactivation, bounded manual searches, member lookup, and owned activation fills that preserve player replacements (mechanics similar to minecraft's Nether Portal).
Detect controller completion, invalidation, and chunk suspension/resumption automatically.
Preserve multiblock identity and declared custom data across world reloads without changing controller inventories, tile data, metadata, or appearances. Failed multiblock reloads retain working definitions.
Add optional exclusive membership and configurable pattern, processing, and instance limits. Automatic completion targets singleplayer worlds; remote-world checks provide diagnostics only.

Run game_tick once per logical client tick, including menus, screens, and paused gameplay.
Run gui_tick after game_tick while a screen is open, and add world_tick after actual client-world simulation updates. Non-pausing screens and remote-world updates continue to receive world ticks.
Require the Java agent for logical tick subscriptions. These callbacks no longer follow rendered frames.