docs(platform,abr,hls,play): flash clock after #600, ducking volumes after #559 - platform: a join poll the task budget turns away retains no slot; a pooled spawn_blocking closure backs off through the engine; the runnable-yield revision points at the merged a2fca2332. - hls: the reader-wake revision points at a2fca2332. - abr: an ABR session reads one clock, the test's under flash. - play: SessionDuckingMode maps to fader volumes, amplitudes 1.0/0.16/0.04.
docs(platform,hls): preserve runnable credit across fairness turns
docs(audio,hls): preserve terminal causes and failed init ownership
docs(events): record HLS and seek ownership
docs: publish crate contracts and ownership in the wiki