web: shared Spec 001 session presentation helpers

[enricopiovesan]

Summary

• Extract mapSessionPresentation / observeSessionPresentation into packages/event-ui-conformance.
• Cut traverse-starter web over to the shared helpers (thin EmbedderEvent adapter).
• Document kit-runner web author notes (host vs session vocab, per-run subscribe, sync-submit paint caveat, smoke prepare) and link from the harness doc.

Governing Spec

• Specs 001 / 002
• Public embedder event likes only in the package; UI remains a rendering layer

Project Item

• Ticket ID: web-session-presentation-shared
• Project item: PVTI_lADOEbiBt84BbzAzzg5tI-g
• Follow-up (Blocked): web-session-presentation-port-primary (PVTI_lADOEbiBt84BbzAzzg5tI_c)

Definition of Done

• Package exports SessionPresentation map/observe (+ tests)
• Starter web uses the package helpers
• Kit / harness docs updated
• Package + starter test/typecheck green

Validation

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

Test plan

• Package: idle / loading→loaded / observe callbacks
• Starter: existing live-presentation + host tests still pass

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