Document PR formatting lesson

Author: brenorb

AGENTS.md

@@ -38,4 +38,5 @@
 - Favor modern macOS 15+ APIs over legacy/deprecated counterparts when refactoring (Observation, new display link APIs, updated menu item styling, etc.).
 - Keep provider data siloed: when rendering usage or account info for a provider (Claude vs Codex), never display identity/plan fields sourced from a different provider.***
 - Claude CLI status line is custom + user-configurable; never rely on it for usage parsing.
+- When editing PR bodies via `gh`, avoid raw `\n` formatting; use proper markdown with literal newlines (prefer `--body-file` or a here-doc) to prevent ugly formatting.
 - Cookie imports: default Chrome-only when possible to avoid other browser prompts; override via browser list when needed.