Fixes#83388.
- Honor per-agent `tools.codeMode` in config schema, runtime code-mode resolution, and model payload filtering.
- Preserve grouped OpenAI tool declarations when code-mode filtering keeps only `exec` and `wait`.
- Sync generated config/prompt baselines and carry a narrow media CI unblocker from current `main` fallout.
Co-authored-by: Kaspre <kaspre@gmail.com>