refactor: replace nanosecond-based timing with atomic second counter#83
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- Replace `nowNano()` method and `created`-based nanosecond timestamps with an atomic `runtimeSeconds` counter refreshed by the Serve loop. - Update eviction and idle checks to use whole seconds instead of nanoseconds, improving performance by avoiding clock reads on hot paths. - Adjust test helpers to accept seconds-ago values directly for clarity and consistency. Signed-off-by: Johan Lindh <johan@linkdata.se>
…tion logic - Add comment explaining uint32 conversion safety for process uptime - Replace lossy uint32-based spare seconds calculation with duration comparison - Ensure minimum spare window of 1 second to match counter granularity Signed-off-by: Johan Lindh <johan@linkdata.se>
Signed-off-by: Johan Lindh <johan@linkdata.se>
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nowNano()method andcreated-based nanosecond timestamps with an atomicruntimeSecondscounter refreshed by the Serve loop.