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Christian PillsburyandClaude Opus 4.8 557d8bd72f refactor(spf): drive live reload via a RecurringRunner instead of an epoch signal (WIP)

Replace the signal-as-event live-reload scheduler with a runner-driven model.
The `resolveTrack` loader schedules its resolve work on a new `RecurringRunner`
that re-runs the task on an injected `reschedule` policy; the separate
`scheduleTrackReload` behavior and its per-type reload-epoch signals are deleted.

Core (`core/tasks`):
- `Task.run()` is now memoized (runs once, shares the result across calls) and
  gains `clone()` (fresh, pending, structurally identical) — added to `TaskLike`.
- `RecurringRunner`: single-slot, id-keyed (dedup same id / abort-and-replace on
  new id), time-free. Each cycle runs `Promise.all([task.run(), reschedule(task,
  previous, signal)])` and re-runs a `clone()` while reschedule resolves `true`.
- `Reschedule<T> = (task, previous, signal) => PromiseLike<boolean>` — invoked
  concurrently with the run, observes it via the memoized `run()`, owns its delay.
- `delayedReschedule(cadence)` builds a Reschedule from a pure ms-cadence fn,
  start-anchored (subtracts the run's elapsed) so reloads are measured from
  load-start per RFC 8216 §6.3.4, preserving half-on-unchanged.

Supporting:
- `@videojs/utils/time`: add cancellable `sleep(ms, signal)`.
- `media/hls/reload-policy`: `mediaPlaylistReloadDelay` (pure cadence; relocated
  scheduler logic — target-duration, half-on-unchanged, stop-on-ENDLIST, retry).
- `resolve-track`: baked universal completeness gate + injected `reschedule`;
  engine composes `delayedReschedule(mediaPlaylistReloadDelay)`.

WIP: not fully validated end-to-end against a live stream through this path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-25 09:59:24 -07:00