docs: Add JSON syntax warning to Ecosystem contribution guide

[jadonamite]

This Commit adds a crucial warning to the Updating the Base Ecosystem Page section.

What changed? Why?

Notes to reviewers

How has it been tested?

Have you tested the following pages?

BaseWeb

• [] base.org
• [] base.org/names
• [] base.org/builders
• [] base.org/ecosystem
• [] base.org/name/jesse
• [] base.org/manage-names
• [] base.org/resources

[vercel]

@jadonamite is attempting to deploy a commit to the Coinbase Team on Vercel.

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[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[jadonamite]

Overview

This PR adds a crucial warning to the Updating the Base Ecosystem Page section.

Motivation

A common source of CI failures in this repository is invalid JSON in ecosystem.json (e.g., trailing commas or unescaped quotes). Contributors often edit the file manually and miss syntax errors.

The Fix

I added a bold warning advising contributors to validate their JSON (using yarn lint or an online validator) before pushing. This will save build time and reduce "fix json" commits.

Checklist

• Added warning block to the contribution steps.
• Formatting is consistent with the rest of the doc.

[jadonsunshine]

Recommendations for YARN validity

[cb-heimdall]

Review Error for jadonsunshine @ 2025-12-29 03:48:16 UTC
User failed mfa authentication, either user does not exist or public email is not set on your github profile. \ see go/mfa-help