Cluster: plan-based gateway, phased startup/shutdown, SWIM membership#31

Merged

farhan-syah merged 11 commits intomainfrom

Apr 15, 2026

Commits on Apr 15, 2026

refactor(cluster): split rpc_codec.rs into per-concern module
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feat(bridge): make PhysicalPlan variants serialisable for wire transport
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refactor(startup): replace Sequencer with gate-based StartupSequencer
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feat(shutdown): add phased ShutdownBus with per-phase drain budgets
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feat(gateway): replace SQL-string forwarding with plan-based gateway routing
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feat(startup): wire gate-based sequencer and gateway into server bootstrap
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feat(security): add clear_and_install_from for in-place registry repair
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refactor: update engine dispatch and plan builders for serialisable plan types
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test: add integration tests for gateway, startup gates, and shutdown phases
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test(startup): add startup_ordering test for gate sequencing invariants
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feat(cluster): add SWIM failure detection and membership protocol
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