feat: TIDAL play-reporting

[lullabyX]

Summary

Opt-in Report plays to TIDAL toggle (default on). On a full listen, sends a
playback_session event to TIDAL's Event Platform (ec.tidal.com/api/event-batch),
driven by the existing notify_track_* lifecycle with a streamingSessionId threaded
through the stream fetch.

Status: does not work — TIDAL drops the tracking

• Events are sent and accepted (HTTP 200, no SenderFault)
• Plays never surface in history. Attribution is gated on a first-party player client_id;
  SONE's community cid can stream but isn't a recognized player, so play_log ignores the events.
• Legacy et.tidal.com (Option A) wouldn't help — same cid, same downstream gate.

State

Pipeline complete, builds clean (0 warnings), 69 tests pass. Kept open as a correct reference.