legacy/v16: Block cross-claim spread (incl. sculk); add fertilize han…#2

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MLG-SERBUR wants to merge 2 commits intolegacy/v16from

backport/sculk-spread-fix

Commits on Oct 3, 2025

legacy/v16: Block cross-claim spread (incl. sculk); add fertilize handler to prevent moss growth across claims
RoboMWM
committed

Commits on Oct 4, 2025

fire charge
RoboMWM
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