Why: U4 frontend switches on StreamEventType; mirror the Go EvSurfaceUpdated (Core #25) so the case typechecks.
Evidence: TS-only; frontend tsc after mirror sync in Dev.
Impact: Type-only additive.
Refs: Core #25/#27; Dev task feature/generative-ui-u4
Why: U4 frontend switches on StreamEventType; mirror the Go EvSurfaceUpdated (Core #25) so the case typechecks.
Evidence: TS-only; frontend tsc after mirror sync in Dev.
Impact: Type-only additive.
Refs: Core #25/#27; Dev task feature/generative-ui-u4
Why: U4 frontend store switches on the event type; the TS union mirrors
the Go EvSurfaceUpdated constant (Core #25) and must include it or the
frontend typecheck rejects the case.
Evidence: go test unchanged (TS-only); frontend tsc in the Dev
workspace after mirror sync.
Impact: Type-only additive.
Refs: Core PR #25; Dev task feature/generative-ui-u4
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Why: U4 frontend switches on StreamEventType; mirror the Go EvSurfaceUpdated (Core #25) so the case typechecks.
Evidence: TS-only; frontend tsc after mirror sync in Dev.
Impact: Type-only additive.
Refs: Core #25/#27; Dev task feature/generative-ui-u4