fix(tui): subscribe to global events for bidirectional Web sync

[MichaelC001]

Use Case

Many users primarily work with TUI at their desk, but occasionally need to continue working from a mobile device or browser when away from the computer.

Current behavior: When you send messages from Web UI while away, returning to TUI shows no updates - you need to restart TUI to see the messages sent from Web.

Expected behavior: TUI should receive and display messages sent from Web UI in real-time, allowing seamless transition between TUI and Web workflows.

This is a practical scenario:

1. Work on TUI at desk
2. Step away, continue conversation via Web UI on phone/tablet
3. Return to desk, TUI immediately shows all messages from Web session
4. Continue working on TUI without missing any context

Problem

• TUI → Web: ✅ syncs in real-time
• Web → TUI: ❌ requires TUI restart to see messages

Root Cause

TUI subscribes to /event endpoint (instance-level Bus), while Web UI publishes events to GlobalBus via /global/event.

Solution

Change TUI to subscribe to /global/event endpoint instead of /event.

Trade-off

TUI will receive events from all directories (if server manages multiple projects). However:

1. TUI only renders matching sessionID - no incorrect data displayed
2. Single-project usage (most common) has no impact
3. Directory filtering can be added client-side if needed

Changes

Minimal change - only 1 file, ~10 lines:

• packages/opencode/src/cli/cmd/tui/context/sdk.tsx
  • Import GlobalEvent type
  • Change sdk.event.subscribe() to sdk.global.event()
  • Extract payload from GlobalEvent.payload

Testing

Verified bidirectional sync works:

1. Start TUI with opencode
2. Open Web UI at http://localhost:<port>
3. Send message from Web UI → TUI shows it ✅
4. Send message from TUI → Web UI shows it ✅