Enable Workspace creation in the demo

[luokerenx4]

Summary

• replace the Demo Workspace creation stub with an in-memory implementation that follows the production response contract
• validate tags and templates, reject duplicate tags with renderable top-level errors, and expose newly created Workspaces through the list endpoint
• return a complete Workspace record so the real UI can navigate directly into the new empty desk
• add handler coverage for creation, list visibility, duplicate tags, and invalid tags

Root cause

The Demo POST /api/workspaces route returned a nested { error: { ... } } object even though the client expects the production { error, message } shape. The form stored that object as renderable error text, causing React to crash to a blank page. The route also disabled a prominent mutation despite the Demo banner promising non-persistent mutations.

Verification

• pnpm vitest run ui/src/demo/handlers/workspaces-create.spec.ts
• npx tsc --noEmit
• cd ui && npx tsc -b
• pnpm test (358 passed, 1 skipped; 3391 tests passed, 9 skipped)
• git diff --check
• Demo browser walkthrough: created chat-jul29, navigated to /workspaces/demo-created-ws-1, confirmed the empty Workspace/session surface renders, then retried the same tag and confirmed an inline duplicate error without a crash

Boundary touch

• none; Demo-only Workspace handlers and tests

[vercel]

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Project	Deployment	Actions	Updated (UTC)
openalice-demo	Ready	Preview, Comment	Jul 28, 2026 9:54pm