Make gestures cooperate with scrolling and feel smoother

From an app built on core-v2:

Scrolling (#3, #4, #14)
- Each recognizer locks onto a touch within its first 6px: along its axis
  and direction it holds the touch, otherwise it lets go. A new
  onTouchmove binding cancels native scrolling only while a recognizer
  holds the touch, so hosts use touch-action: manipulation and one
  vertical gesture no longer disables vertical scrolling. Several
  gestures on one host share touches through the same rule.
- .from.scrollEdge(scroller, edge) admits drag-to-dismiss only while a
  scroller is at the edge (#5).

Feel
- recognition.distance sets what counts as full progress: pixels, a CSS
  length, or a measuring function (#6).
- Choreographies receive overshoot, the drag past either end of the
  clamped progress, and the settling spring starts from it (#7).
- Velocity is the least-squares trend of the last 100ms (#8).
- Defaults retuned to commitThreshold 0.25 and commitVelocity 0.2; the
  slide presets use them (#9).
- Choreographies may set spring stiffness and damping (#10).

Hooks and helpers
- .onArm()/.onDisarm() run during a drag when releasing would start or
  stop committing (#12).
- startedIn, nearEdge, atScrollEdge, anyOf, allOf start predicates (#15).
- Development builds warn when an operation's first frame moves a node
  that was visibly at rest, the one-frame "pop" of mismatched open and
  close choreographies (#16).

Docs: scrolling, ignored elements, animation performance, haptics, and
operating-system edge gestures including CloseWatcher/popstate for PWAs
(#11, #17, #18).

Verification: a Chromium harness with emulated touch (verify/browser)
checks swipes over scrollers, native scrolling beside gestures,
scroll-edge dismissal, onCommit inside pointerup, and the continuity
warning. Reverting the earlier capture fix makes it fail exactly as
reported ("none of the handles work").

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Faarh2Ts6StJPcz2mRiHiR

packages/core-v2/verify/README.md

@@ -18,3 +18,20 @@ process biases whichever runs second.
 Behavioural verification lives with the unit tests: `tests/property.test.ts`
 drives random operation sequences and pointer streams and checks the scene's
 structural invariants after every step. Set `PROPERTY_SEEDS` to run more.
+
+## Real-browser touch checks
+
+`browser/` drives a development build in Chromium with emulated touch input,
+which happy-dom cannot model: implicit touch pointer capture, native scrolling,
+`pointercancel`, and rendered styles. It checks that swipes over scrollers
+commit, that scrolling still works beside gestures, scroll-edge dismissal,
+that `onCommit` runs inside `pointerup`, and the development continuity
+warning.
+
+```sh
+NODE_ENV=development npx vite build --mode development \
+  --config packages/core-v2/verify/browser/app/vite.config.mjs
+node packages/core-v2/verify/browser/run.mjs
+```
+
+Set `CHROMIUM_PATH` to use a Chromium other than Playwright's own.