Engine v5.1.5

• Replaced Three.js BloomNode with a fixed-topology Dual Kawase bloom pyramid, reducing bloom render passes from 12 to 9 while preserving live strength, radius, and threshold controls.
• Moved runtime FX reaping onto each entity's active simulator so client-auth owners and place hosts publish completed-effect deletes through the normal state-delta lane.
• Moved onSoundEnd tracking and dispatch onto the active simulator instead of the server replica.
• Added server-sequenced, place-scoped custom-event fanout so client-auth simulators can invoke their local api.on subscriptions.
• Made vehicle/control handoffs server-canonical, with two-phase A→B switching that uploads the old target's onControlEnd cleanup before the server atomically grants the new target and runs onControlBegin on its simulator.
• Fixed severe WebGPU frame-presentation stalls by avoiding 4x scene MSAA on Retina DPR-2 displays, where native pixel density already supplies edge smoothing.
• Skipped PCF filtering and transmitted-color texture sampling for resident shadow lights whose runtime intensity is zero, while preserving stable lighting pipelines.
• BREAKING: Changed keyboard axis polarity from a hidden key-name lookup to positional negative/positive pairs. input-config.ts now assigns alternating -1/+1 scales to slash-separated keys, so arbitrary pairs such as f/r behave predictably and reversing the string reverses the axis.

Reorder every multi-key inputs.axes.*.keys binding into explicit negative/positive pairs. The first key in each pair now produces -1 and the second produces +1, regardless of the key names.

Replace forward/back bindings such as { keys: "w/s" } with { keys: "s/w" }, and { keys: "ArrowUp/ArrowDown" } with { keys: "ArrowDown/ArrowUp" }. Existing negative/positive bindings such as { keys: "a/d" }, { keys: "q/e" }, and { keys: "a/d/ArrowLeft/ArrowRight" } do not need changes. For arbitrary controls, order each pair by meaning; for example { keys: "f/r" } means F = -1 and R = +1. A single-key axis still produces +1.