- The trailing visibility frame uses the layer's injectable runtime timer and
is cancelled by resetState as well as disable and destroy.
- An empty-feed regular pass records the camera pose, so later in-cadence
frames do not keep scheduling trailing frames.
- New renderGovernor.test.mjs: a parked camera schedules nothing, a stopped
camera gets exactly one trailing frame and no self-wake, a forced pass
requests its frame, destroy cancels the timer.
- The CHANGELOG entry moves to changelog.d/871-vessels-idle-render.md; docs
say the hold also covers vessels dimmed under a live target.