v1.8.4

Ported to 26.3-pre-1, along with these changes:

Major Changes

• envelopes now play the sealing sound when sealed by an endpoint
• fixed component data leak when endpoint seals an item with no components

Minor Changes

• simplified instances of swing @s mainhand to swing, kill @s to kill
• made float multiplication (i.e. motion scaling) use the minecraft:mul number provider
• replaced placeholders for removed recipes with filter blocking
• simplified small armor stand breaking logic