Session segmentation launcher - #140
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Add SegmentCoordinator and immutable per-segment contexts, rotate log ownership without restarting CUPTI, preserve dictionaries and scope continuations, and emit segment lifecycle snapshots. Use explicit move-only writer leases for the cutover drain barrier. Publication seals the retiring context before exposing the next one; retirement waits with a bounded timeout and leaves an honest incomplete segment instead of hanging teardown or closing under a live writer.
Add Runtime::hasSegmentContext for check-only paths so they no longer manufacture short-lived writer leases. Keep explicit writer accounting for real serialization paths and document why use_count was safe from premature close but unable to express producer ownership.
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Description
SegmentCoordinatorType of Change
Testing
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