docs: add example config.toml #5175
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I was missing an example config.toml, and following docs/config.md alone was slower. I had GPT-5 scan the codebase for every accepted config key, check the defaults, and generate a single example config.toml with annotations. It lists all keys Codex reads from TOML, sets each to its effective default where it exists, leaves optional ones commented, and adds short comments on purpose and valid values. This should make onboarding faster and reduce configuration errors. I can rename it to config.example.toml or move it under docs/ if you prefer.