Fix markdown linting issues in protocol/README.md

[Copilot]

Resolves markdown linting errors identified in CI build for PR #308 by addressing two specific rule violations:

Issues Fixed

1. MD031/blanks-around-fences - Missing blank line before code block

Problem: Code block at line 175 was missing a required blank line before it.

Note: The agents property may not be in the TypeScript definitions. Use type assertion if needed:
+
```javascript

2. MD029/ol-prefix - Inconsistent ordered list numbering

Problem: Ordered list items in the "Adding Custom Agent Headers" section were using sequential numbering (2, 3, 4, 5, 6) instead of the consistent "1." format required by the style guide.

-2. Direct HTTP Requests
-3. Agent Naming Conventions  
-4. Adding to agents.json
-5. Testing Agent Headers
-6. Version Management
+1. Direct HTTP Requests
+1. Agent Naming Conventions
+1. Adding to agents.json
+1. Testing Agent Headers
+1. Version Management

Verification

All markdown linting issues have been resolved:

• ✅ npm run format:documentation:check passes with 0 errors
• ✅ Specific MD029 and MD031 rule checks pass
• ✅ Full lint suite (npm run lint) passes successfully

These changes ensure the documentation follows consistent markdown formatting standards without affecting the content or functionality.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.