feat(review): run natu for Nix targets

.pi/prompts/review.md

@@ -17,6 +17,15 @@ If the target includes multiple matching file types, use all matching skills.
 If the target is a diff, choose skills from the changed files.
 Do not use a style skill when no reviewed file matches it.
 
+For every reviewed `*.nix` file, run:
+
+```bash
+bazel run //src/natu:natu -- <reviewed-nix-paths>
+```
+
+Pass every reviewed Nix path to Natu.
+Report every Natu diagnostic as an actionable finding.
+
 Report only actionable findings.
 Order findings by severity.
 Do not report preferences unless a loaded rule states them.
@@ -36,6 +45,7 @@ Keep the code excerpt to one to three lines when possible.
 Use a longer excerpt only when the violation needs surrounding context.
 Use `...` to omit unrelated lines from a multi-line excerpt.
 Use a style-skill rule citation in the form `skill::rule-file:line`.
+Cite Natu diagnostics as `natu::<rule-id>`.
 Make the fix direct.
 Do not include alternatives when one fix best follows the cited rule.