Jay's two playtest PRs are now in main:
- #1 emulator hotkeys (P/Space pause, K frame-advance, F2/F4 save/load)
- #2 emulator rewind (R held, 600-frame ring buffer)

Both rebased onto current main with the 0.1.16 pause-freeze conflict resolved
so paused/rewind/normal-step coexist. Bumping so the next publish ships these
(0.1.17's tag predates them).