Water buckets place water in the Nether instead of evaporating #52

Ordinary bucket placement creates a water source in an ultrawarm Nether world. The existing ultrawarm flag only drives sponge drying and is not consulted by the bucket paths.

Evidence

• server/bedrock_actions.go:326 places water via the generic bucket branch.
• java/handler/block.go:2000 has the same unconditional water placement.
• core/world/world.go:1308 checks ultrawarm for wet sponges, but does not prevent the above water placement.

A Bedrock handler probe used a Nether-dimension player and SetUltrawarm(true); using a water bucket on stone produced minecraft:water above it.

Client verification

In the Nether, empty an ordinary water bucket onto a solid block from each edition.

Acceptance criteria

• Apply the dimension's evaporation rule to ordinary water-bucket placement.
• Consume/return the bucket correctly by game mode and send evaporation feedback.
• Audit aquatic-bucket release and waterlogging against the same target-version rules.
• Preserve valid water-cauldron behavior rather than rejecting all water-related actions in the Nether.

Audit basis

Reviewed feat/go-events-api at f5ce83d on 2026-09-11. A temporary Go probe asserted the expected behavior and failed on this revision. Verification was at handler/simulation or real temporary Anvil-storage level, not through a live client. The client steps are a verification recipe.