test(ui): React parity — StartTransition applies updates#38
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Ports React's ReactStartTransition: a state update wrapped in rt.StartTransition commits to the host DOM; multiple updates inside one transition all take effect; a same-value transition update is a no-op. Verified via the native reconciler harness. All pass; no GWC bug. No version bump. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
monstercameron
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…owner-level) DEVNOTES only. #38 runtime diagnostic is infeasible via reflect (Go hides the closure environment pointer); recommend folding into #78's identity scheme. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
monstercameron
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Without explicit keys, sibling inline-closure components share one code-pointer identity, so the reconciler binds hook state to slot position not logical item — insert/delete/reorder shows the wrong item's state. No correct silent auto-fix exists (position is unstable under reorder; the framework needs keys like React), so warn. reportUnkeyedComponentAliasing (dev-only, warn-once) flags 2+ unkeyed component siblings sharing an identity and advises WithKey; complements the existing mixed-keying warning. Also resolves #38 (distinct-closure detection is infeasible, but sibling-identity collision is detectable). Pinned; full library gate + wasm vet green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Ports ReactStartTransition: transition-wrapped updates commit, multi-update, same-value dedup. All pass; no bug. No version bump.
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