starter-web: live Spec 001 presentation from subscribe

[enricopiovesan]

Summary

• Wire traverse-starter web so Spec 001/002 session presentation updates from each subscribed embedder event during submit (onPresentation / observeSessionPresentation).
• Prefer live presentation fields in the UI; keep terminal HostRunResult for output/errors.
• Document that a visible loading flash is not guaranteed under sync submit (no forced yield — decision A1/S1).

Governing Spec

• Specs 001 (UI event state conformance) and 002 (capability event UI subscription)
• Public traverse-embedder-web subscribe + submit only; UI remains a rendering layer

Project Item

• Ticket ID: starter-web-live-presentation-subscribe
• Project item: PVTI_lADOEbiBt84BbzAzzg5tFlA

Definition of Done

• Host exposes mapSessionPresentation / observeSessionPresentation (empty → idle)
• submitNote notifies presentation after each event; App renders live Session presentation / capability steps
• Unit tests assert mid-stream loading before terminal loaded
• No forced yield; no business-field invention; no Traverse runtime changes
• Starter web README notes sync-submit paint caveat
• npm run test + typecheck for starter web green

Validation

npm run test -w apps/traverse-starter/web-react
npm run typecheck -w apps/traverse-starter/web-react

Test plan

• Unit: submitNote presentation callback includes loading then loaded
• Unit: observeSessionPresentation idle → loading → loaded across submit
• App test: Session presentation shows loaded after submit
• Optional manual: smoke bundle + submit note; confirm Session presentation / capability steps render

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