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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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Observability: log backend failures instead of swallowing, instrument writes, clean clippy
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Concurrency/Perf: seal worker spawns, off-thread forge import, bound caches
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Perf: seal worker panic isolation behind worker_runtime
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Move similarity / near-duplicate VP-build off the egui thread (Chronic #1, 3/3)