feat(tool-world): deterministic tool-use environment for tool calling, MCP, browser, and delegation families (design + first slice)

feat(tool-world): deterministic tool-use environment for tool calling, MCP, browser, and delegation families (design + first slice) ## What Implements the first slice of [#422](https://github.com/rmems/synthetic-factory/issues/422) (Linear RM-2070): the generator side of the tool-world families (tool calling, MCP, browser, agent delegation). 1. `docs/tool-world-families-design.md`: the design (VSET oracle-kind and record-kind ## 🤖 CodeAnt AI — Review Status | Status | Commit | Started (UTC) | Finished (UTC) | | --- | --- | --- | --- | | ✅ Incremental review completed | `c3fb917` | Oct 09, 2026 · 14:11 | 14:11 | | ✅ Incremental review completed | `bae6434` | Oct 09, 2026 · 11:32 | 11:33 | | ✅ Reviewed your PR | `ace3ff6`... --- ### Thanks for using CodeAnt! 🎉 We're free for open-source projects. if you're enjoying it, help us grow by sharing. [Share on X](https://twitter.com/intent/tweet?text=Just%20tried%20%40CodeAntAI%20for%20automated%20code%20review%20and%20I%27m%20impressed%21%20Free%20for%20open%20source%20wit... <img src="https://storage.goo...