feat(demo): simulate trading order pushes

[luokerenx4]

Summary

• return deterministic, non-persistent demo push results for place, close, and cancel order endpoints
• mark demo results explicitly as simulated so the order dialog never claims a broker accepted them
• add demo handler contract coverage for all three order mutations

Why

The demo exposes the complete manual order form and says mutations are simulated, but every trading submission previously ended in a hard-coded read-only validation error. That prevented visitors from seeing the stage → commit → push result surface. This keeps the demo safe and non-persistent while allowing the workflow to complete honestly.

Verification

• git diff --check
• npx tsc --noEmit
• pnpm test (358 passed, 1 skipped; 3391 tests passed, 9 skipped)
• cd ui && npx tsc -b
• pnpm -F open-alice-ui build:demo
• walked pnpm -F open-alice-ui dev:demo --host 127.0.0.1 in the real Portfolio → Alpaca Paper route
  • Place Order shows 1 operation simulated
  • AAPL Close Position shows 1 operation simulated
  • both state that no order was sent to a broker and portfolio data was not changed

Safety

Demo MSW handlers only. No UTA state-machine, broker adapter, configured account, or live-paper path was exercised or changed.

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Project	Deployment	Actions	Updated (UTC)
openalice-demo	Ready	Preview, Comment	Jul 28, 2026 7:37pm