Transport law: stop resumes at the playhead, stop TWICE rewinds

Paul: "When I hit stop and start keep playing at the playhead. If I click stop TWICE, then reset to the beginning."

• The first stop already recorded the measure (the bookmarkable-mix work) so ▶ resumes at the playhead. Now a stop while ALREADY stopped

Verified: share-url-run grows the transport-law checks (stop remembers, double-stop rewinds, URL m dropped) — 13/13; explorer-ui + access-ui green.

▶ Play it: Stationary Weather — a long-form genre — put the phone in your pocket and it keeps playing https://stellate.app/?genre=ambient&seed=3807&path=2103.13280,2122.13313,2084.13313&xdur=13.122

74ef73c https://github.com/aboard-io/stellate/commit/74ef73cfdb5cb7a47cfb4ac01af4604fb160ceac