# PDD-NN — [Direct, memorable name]
Token: PDD-NN
Version: v1

## Lineage

[If the rule has an established name or standard, name it and link to a primary source. Otherwise, write “Repository-specific.”]

## Rule

[State the rule in two or three direct sentences.]

## Benefit

[State what time, complexity, or risk the rule removes.]

## Problem this prevents

[Name the repeated agent or engineering behavior that earned this rule.]

## What this changes

- [State what writers must do.]
- [State what readers can assume.]
- [State what reviewers must reject.]

## Exceptions

[Name narrow exceptions and their proof. If no exception exists, write “None.”]

## History

- v1 (YYYY-MM-DD): Adopted because [evidence or repeated finding].