v1.0.18 - Codex streaming

Changes

• Add native Codex app-server run streaming endpoints for live tool-call and assistant delta events.
• Update chat UI to use EventSource for Codex agents, render live tool cards, and support streamed stop/interrupt.
• Persist streamed Codex results back into Codex chat history.
• Add smoke coverage for Codex stream server/client/provider wiring.

Verification

• npm test
• Python compile check
• node --check src/client/js/chat.js
• Live 8590 SSE smoke emitted run.started, tool.started, message.delta, and run.completed.