WORKFLOW: Add CHANGELOG.md to build-deploy trigger paths

- Ensures changelog updates automatically trigger landing page deployment
- Keeps version display synchronized between git tags and web display
- Resolves version mismatch on https://carbondirect.github.io/BOOST/

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

Co-Authored-By: Claude <[email protected]>

Author: pwt-cd

.github/workflows/build-deploy.yml

@@ -8,6 +8,7 @@ on:
       - 'drafts/current/specifications/**'
       - 'drafts/current/schema/**'
       - '.github/workflows/**'
+      - 'CHANGELOG.md'
 
   # Allow manual triggering
   workflow_dispatch: