Assess composer-to-Stash motion and existing PR

Review existing PR #10134 without editing its dirty worktree or branch. Verify shallow arc, common 550 ms start/deadline, final destination layout, interruption and reduced motion. Reuse the existing PR if it covers the suggestion; only build a separate focused follow-up if a concrete gap remains.

Requested by Alex after the T3 UI motion audit. First record an independent Astra-medium accept/revise/reject verdict with source evidence. Accepted changes should end in small focused PRs; do not implement a rejected suggestion.

Use the installed shadcn-motion-ui skill and Human Interface Craft guidelines (feedback, relationship, continuity, accessibility, signature moments). Consult current official docs, reuse local primitives, verify installed API compatibility and add exact source references. Respect native platforms, reduced motion, interruptions, responsiveness, focus, and performance. No continuous repaint loops or framework rewrites.

Acceptance:

• Independent assessment and overlap check recorded.
• Accepted scope implemented and focused checks pass, or rejection/dependency documented.
• Best-effort independent cross-provider review recorded.
• Real before/after motion evidence and PR linked, with any missing evidence disclosed as a draft-readiness gap.

Do not change live user data, the dirty primary checkout, existing Stash worktree, or unrelated work. No merge or deployment is requested.

Start by reviewing PR #10134 without modifying its dirty worktree or branch, then use the installed shadcn-motion-ui skill and Human Interface Craft guidelines to assess the composer-to-Stash motion. Record an independent accept/revise/reject verdict with official source references and check the shallow arc, 550 ms timing, destination layout, interruption, reduced motion, focus, responsiveness, and performance. Done means overlap is resolved and either a focused PR with before/after evidence and checks is linked or the rejection, dependency, and missing evidence are documented.