JDK 25 compatibility: Drop JDK 8 support, JCTools 4.x, VarHandle fencing, CI modernization#6

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halotukozak wants to merge 19 commits intobump-dependenciesfrom

docs(04-jdk-25-compatibility): create phase plan

halotukozak
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claude
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feat(04-01): upgrade JCTools from 3.3.0 to 4.0.5
halotukozak
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docs(04-01): complete JCTools 4.0.5 upgrade plan

halotukozak
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claude
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feat(04-02): modernize CI workflow with JDK 25 matrix and updated actions
halotukozak
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docs(04-02): complete CI workflow modernization plan
halotukozak
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chore: remove .planning from git tracking

halotukozak
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claude
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fix(04-03): replace sun.misc.Unsafe.fullFence() with VarHandle.fullFence() in queue wrappers
halotukozak
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fix(04-02): add sbt via setup-java cache parameter

halotukozak
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claude
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fix(04-02): trigger CI on all pull requests

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claude
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fix(04-02): install sbt via sbt/setup-sbt@v1

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claude
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