Scaffold meeting-notes web-react (#57)

[enricopiovesan]

Summary

• Add apps/meeting-notes/web-react/ — second domain app demonstrating list-type runtime output (action_items, decisions, follow_ups, summary)
• Wire workspace, CI repository checks, and board-hygiene docs (README + design-language)
• UI renders runtime-owned fields only; empty arrays show "None recorded"

Closes #57

Definition of Done

• apps/meeting-notes/web-react/ scaffolded with transcript input (5000 char limit)
• Env defaults: VITE_TRAVERSE_* with capability meeting-notes.process
• Output sections: action items (owner/due), decisions (made_by), follow-ups, summary
• Empty arrays render "None recorded"; offline/error states handled
• Unit tests for parser + App integration (all four sections + empty arrays)
• README contrasts with traverse-starter; package workspace + repo checks updated

Validation

• npm run typecheck -w apps/meeting-notes/web-react
• npm run lint -w apps/meeting-notes/web-react
• npm run test -w apps/meeting-notes/web-react (24 tests)
• npm run build -w apps/meeting-notes/web-react
• bash scripts/ci/repository_checks.sh

Architecture boundary

• No business logic in UI (fields come from runtime output only)
• No private Traverse internals imported
• HTTP client uses public 033-http-json-api surfaces only

Platform status updates

• README.md — meeting-notes web-react marked Shipped; removed from What's Blocked
• docs/design-language.md — reference implementation row added
• AGENTS.md — N/A (platform status lives in README per current AGENTS.md)

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