Pro DJ Link Simulator 0.4.0-dev-55

Pro DJ Link Simulator 0.4.0-dev-55 — two-player soak control

This simulator-only development release turns the narrow USB-backed player
into a two-player lab source without adding any code to the Lumi production
runtime.

Included

• two independently discoverable player identities from one Mac and USB;
• separate load, play, pause, seek, pitch, Master and On Air controls;
• bounded loops with visible loop range and wrap count per player;
• Auto Mix with a configurable 5–3600 second interval;
• deterministic handoffs: the incoming player restarts, becomes On Air and
  Master, then the outgoing player pauses;
• authenticated API and CLI control for every new function;
• a compact two-player browser UI suitable for remote Mac mini operation.

Verification

• all 20 simulator configuration, API, packet, loop and Auto Mix tests pass;
• the shaded Java 21 build passes;
• version consistency and repository structure pass locally;
• the packaged app read a real Rekordbox USB, loaded separate tracks on both
  players, preserved overshoot through a 10–15 second loop and completed three
  five-second Auto Mix handoffs;
• stopping the simulator released ports 50000 and 17840, after which the Lumi
  Dev engine and Pro DJ Link bridge restarted normally.

The Auto Mix mode is a repeatable soak driver, not a DJ transition model. It
does not mix audio. A two-host LAN run remains the final evidence that Lumi sees
both player identities and follows repeated Master changes for an extended
period.