Check recipes before searching for how to do something

Before searching the codebase or the web for how to perform a project operation, check doc/recipes/ first. Recipes are tested how-to documents that answer "how do I X?" for every common workflow in the project.

Why: The recipes directory is the canonical source for operational knowledge — build, test, deploy, git, codegen, documentation workflows. Searching blindly wastes time and may produce incorrect answers. The user explicitly asked to use recipes as the first port of call.

How to apply: When about to ask "how do I build?", "how do I create a doc?", "how do I run codegen?", "how do I start a story?" — open doc/recipes/ and look for the relevant topic index (cmake, codegen, documentation, git, agile, etc.) before doing anything else. The recipe index is at Recipes.