effect/.changeset/split-clock-semantics.md

effect

effect
minor

Separate wall-clock timestamps from monotonic elapsed time.

Clock.Clock now requires monotonicTimeNanosUnsafe() and monotonicTimeNanos for measuring elapsed time. Custom Clock implementations must provide both members. The live clock's currentTimeNanos now re-anchors its high-resolution Unix wall-clock timestamp when it drifts from Date.now(), while Effect.timed, duration metric tracking, and Sink.withDuration use monotonic time so wall-clock corrections do not distort elapsed durations.