Add prose-wrap policy: hard-wrap markdown at 80 columns

Configure prettier with proseWrap: always. Reformat all markdown
files to conform.

README.md

@@ -11,21 +11,21 @@ git clone https://github.com/sneak/prompts.git
 cd prompts
 ```
 
-Prompts are stored as Markdown files in the repository root. Copy or
-reference them as needed in your projects.
+Prompts are stored as Markdown files in the repository root. Copy or reference
+them as needed in your projects.
 
 ## Rationale
 
-LLM prompts, especially development policies, benefit from version control
-and a single authoritative source. This repo provides a central place to
-maintain, share, and evolve prompts across projects.
+LLM prompts, especially development policies, benefit from version control and a
+single authoritative source. This repo provides a central place to maintain,
+share, and evolve prompts across projects.
 
 ## Design
 
-The repository is a flat collection of Markdown files. Each file contains
-one or more related prompts or policy documents. There is no build step or
-runtime component; the prompts are consumed by copying them into other
-projects or referencing them directly.
+The repository is a flat collection of Markdown files. Each file contains one or
+more related prompts or policy documents. There is no build step or runtime
+component; the prompts are consumed by copying them into other projects or
+referencing them directly.
 
 ## TODO