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docs/conventions.md

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+# Conventions
+
+## Rust Style
+
+- Prefer `use serde_json as json;` whenever a file works with JSON values or macros.
+- Keep functions on the happy path.
+- Use early exits for optional values with `let Some(x) = maybe else { return ...; }`.
+- Avoid deep nesting when an early return makes the flow clearer.