Add code runtime output helpers

[RhysSullivan]

Summary

• Add explicit code output helpers for text, images with detail metadata, audio, files, resources, and notifications across the code runtimes.
• Preserve emit behavior while routing helper output through the same user-visible output path.
• Add bounded Object.keys(tools) discovery for built-in tool namespaces.

Validation

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

Stack

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

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commit: 6f46e1b