Trace tool calls from code cells

[RhysSullivan]

Summary

• add trace correlation metadata around tool calls started by persistent code cells
• cover the emitted cell tool span through the cloud e2e telemetry surface

Validation

• bun run format
• bun run lint
• bun run typecheck
• cd e2e && ../node_modules/.bin/vitest run --project cloud cloud/codemode-cell-telemetry.test.ts

Stack

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

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commit: eb6d8aa