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Adopt lint block, pin stable toolchain, cargo fmt, fix clippy
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Apply rustfmt across the crate
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Performance: move single-sample suggest to worker, probe bit depth off the DB lock
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Perf A+: spawn_job one-shot seal + DB persistence bench
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Fix three ultra-fuzz launch-blockers: LUFS normalize, worker panics, import orphan blob
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Triage UX audit of classifier Settings sections