fix: Remove validate-llm-yml job from CI workflow

The llm-yml package is not yet published to npm, causing CI failures.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
Local-Dir: /Users/d/Projects/claude-code-sdk-ts/claude-code-sdk-ts

Author: acebytes

.github/workflows/ci.yml

@@ -46,18 +46,3 @@ jobs:
         flags: unittests
         name: codecov-umbrella
 
-  validate-llm-yml:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    
-    - name: Use Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version: '20.x'
-    
-    - name: Install llm-yml validator
-      run: npm install -g llm-yml
-    
-    - name: Validate LLM.yml
-      run: llm-yml validate ./LLM.yml