R360: the ease and its switch come out again (#153, #175)

[Devski]

Dawid's decision of 12.09.2026, the day after it shipped: the product is losing functions rather than gaining them.

Out: the eased travel from #153 and the owner's Motion switch over it. #175, which was to turn that switch into two owner-set amounts, is closed unmerged — none of it ever reached main.

What is left

A release still coasts: a thrown orbit keeps turning and slows to a stop. That is the one curve the arithmetic keeps, and it is not kept for the look of it — constant slowing is where the motion coastAfterDrag measures out actually puts a thing.

A click on the ring, on a marker, or on a cue button travels at one pace from beginning to end, as it did before 11.09.

What that touched

• orbit.ts: the eased curve and glides() are gone; TravelCurve is steady | slowing. The coast no longer asks the switch for permission — a release coasts unless the pointer was cancelled rather than lifted, or the visitor's system asks for less motion.
• frame-set-shared.ts: glide is out of the params schema, and out of isDefaultR360Params.
• r360-params.tsx: the Motion control is gone from the edit form; five parameters again.
• The dictionaries lose four keys in both languages; schema.ts loses the field from the stored-row type and says five parameters in its comment; the unit tests lose the glide cases; works.spec.ts loses the switch walkthrough.
• SPEC A13 says five parameters, and says plainly what happened to the sixth and why.

Saved works

A work saved while the switch existed may still carry glide in r360_params. Nothing breaks and nothing needs doing: the params object drops keys it does not know on the way in, so such a work reads as one without a switch — which is what it now is. No migration.

Verified

pnpm check green, pnpm build green, r360.spec.ts + works.spec.ts 20/20 against the test database — including the #153 case that a reduced-motion visitor is not thrown, which is still true and still the coast's own rule.

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