- The Trestle intro comm now fires on the first discovered world (the
starter quest's own witness, `discoveredWorldCount`) instead of the
first planet in a foreign system, so the comm and the quest can never
drift; delayMs drops to 0 so it lands at the moment of discovery.
- The scene's `busy()` contract is now comm-type-aware: audio-only comms
(voice, no box, no pause) ride over in-progress actions like mining or
a scan sweep, while ack/visual comms still wait; modal windows and a
jump in flight block every type.
- Add the `comms-mine` dev harness that walks the type-aware busy
contract (free scene → real mining → audio comm mid-mining → jump) and
update the trestle dev scripts/tests to the new trigger and witness.
- Arm the pair on scene-create for loaded saves that already hold
discovered worlds, and widen the cdp-shot ready dump.
- Add ice-shop art/video assets.
