Remove docs ecosystem agent guidance

Author: decofe

AGENTS.md

@@ -49,10 +49,6 @@ Content for step 2.
 
 See https://mpp.dev/guides/multiple-payment-methods for a reference example.
 
-## Ecosystem Pages
-
-When adding or moving ecosystem partners, keep partner entries alphabetized by partner name within each category page under `src/pages/ecosystem/` and within the mirrored category sections in `src/pages/quickstart/developer-tools.mdx`.
-
 ## Project Structure
 
 - `src/pages/` - MDX documentation pages