mnasyrov / nrgy / 26574473012

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fix: prevent lost scheduler tasks under wrapped ring buffer growth

Two bugs caused effects to be silently dropped under load:

- `reserveFastRingBuffer` performed an in-place reflow that overwrote
  its own source slots when the buffer was wrapped (head > 0), losing
  items on growth. Replaced with a single-pass relocation of the
  wrapped tail into the freshly grown space; head is preserved so
  source and destination ranges are guaranteed non-overlapping.

- `createMicrotaskScheduler.resume()` set `isPaused = true` instead of
  `isPlanned = true` when re-arming execution after a planned microtask
  drained while paused. The follow-up execute() then exited immediately
  on the still-true isPaused flag, leaving queued tasks unprocessed.

Both bugs surface in real apps as missed effect notifications when the
shared async scheduler has prior activity and a burst of new effects.

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