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server: adopt lint block, fix clippy, fmt
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Format the tree with rustfmt and add the lint + supply-chain gates
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Remediate audit Run 21 findings across server
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Payments resilience: fan-out dead-letter, billing guards, inbound idempotency
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payments: close refund crash-window, seal enforcement_mode enum, license-key idempotency
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synckit: move usage-warning sends off the scheduler tick onto the bounded pool (ultra-fuzz Run 3 CHRONIC)
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synckit: enforce paid-only first-party sync + authoritative blob size + atomic caps (ultra-fuzz Run 3 #1/#2/#3)