Embed WASM runtime: web-react clients (#113)

[enricopiovesan]

Summary

• Migrate traverse-starter and doc-approval web-react clients to traverse-embedder-web (BundleEmbedder / EmbedderTestDouble)
• Zone 1 shows Embedded + Ready/Unavailable (no sidecar URL)
• Vendored SDK at vendor/traverse-embedder-web (Traverse 0.7.0 / #646); sync script for starter bundles
• Doc-approval production init remains Unavailable until #112

Governing Spec

• Traverse 068-public-platform-embedder-packages
• Traverse 057-embeddable-runtime-host (embedder-api/1.0.0)
• App-References docs/embedded-runtime-plan.md / docs/design-language.md

Project Item

• Issue: Embed WASM runtime: web-react clients (traverse-starter, doc-approval) #113
• Project 2 item: PVTI_lADOEbiBt84BbzAzzgx7Ygc

Definition of Done

• Web apps use embedded host on production path (no traverse-cli serve)
• Zone 1 shows Embedded runtime status
• Tests use EmbedderTestDouble
• Lint / typecheck / tests / coverage gate pass
• Board docs updated

Validation

• npm run test -w apps/traverse-starter/web-react
• npm run test -w apps/doc-approval/web-react
• npm run lint / typecheck for both workspaces
• bash scripts/ci/coverage_gate.sh
• bash scripts/ci/repository_checks.sh

Architecture boundary

• UI only calls public traverse-embedder-web APIs
• No private Traverse internals; no business fields computed in UI

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