v0.1.0 skel

docs/coding_rules.md

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+# Coding Rules
+
+## Hard Constraints
+- No `?`
+- No `unwrap` / `expect`
+- Explicit error handling only
+- No `mod.rs`
+- tracing obligatoire
+- banned: anyhow, thiserror
+
+## Example
+
+match do_work() {
+    Ok(v) => v,
+    Err(e) => return Err(MyError::from(e)),
+}