fix: add blank line and language specifier to code block in claude-code-feature-dev-comparison.md

- Add blank line before code fence (MD031)
- Add 'text' language specifier to code block (MD040)
- Fixes linting errors identified in CodeRabbit review

Co-authored-by: Gregg Coppen <[email protected]>

Author: github-actions[bot]

docs/research/codebase-context/claude-code-feature-dev-comparison.md

@@ -603,8 +603,8 @@ For key user flows, trace the execution path:
 - Output/response generation
 
 **Example Flow:**
-```
 
+```text
 User Login:
 
 1. POST /api/auth/login → routes/auth.ts:23