Add persistent code execution cells

[RhysSullivan]

Summary

• add persistent code execution cells to the execution engine
• expose start/wait/terminate cell operations through HTTP and MCP
• cover persistent cell execution through public e2e scenarios

Validation

• bun run lint
• bun run typecheck
• cd e2e && ../node_modules/.bin/vitest run --project cloud scenarios/codemode-persistent-cells.test.ts
• cd e2e && ../node_modules/.bin/vitest run --project selfhost scenarios/codemode-persistent-cells.test.ts

Stack

1. Add code runtime output helpers #1073
2. Add persistent code execution cells #1074 👈 current
3. Trace tool calls from code cells #1072

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commit: 0d0215d