test(examples-chat): regression coverage for GenUI emit coalescing (PR C)#299
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…de wiring) Three independent PRs per spec's phasing (order A → B → C): - PR A — Surface store + catalog shape (lib only) [this branch] - PR B — <a2ui-surface> per-component rendering (lib only) - PR C — Backend coalescing + envelope reordering (Python only) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Asserts emit_generated_surface returns 2 replacements (3-message thread post-merge, not 4), preserves the upstream tool-call AI's id, tool_calls, additional_kwargs, response_metadata, and orders the wrapped envelopes surfaceUpdate -> beginRendering -> dataModelUpdate.
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Summary
Phase C of the progressive GenUI rendering redesign. Locks in the GenUI emit-node invariants with pytest. The backend coalescing + envelope reorder code already shipped in #255; this PR adds explicit regression coverage for both invariants.
Spec: `docs/superpowers/specs/2026-05-11-progressive-genui-bubble-coalescing-design.md`
Plan: `docs/superpowers/plans/2026-05-11-progressive-genui-bubble-coalescing.md`
Test plan