refactor: remove unused fallback code and increase Claude timeout

🧹 Code Cleanup:
- Removed unused create_fallback_changelog function
- Function was left over from when we had fallback changelog generation
- Now using fail-fast approach - Claude must succeed or workflow fails

⏱️ Increased Claude Timeout:
- Claude changelog generation timeout: 60s → 240s (4x increase)
- Allows more time for complex changelog analysis
- Reduces chance of timeout failures for large changesets
- Still fails fast if Claude is unavailable or errors occur

Result: Cleaner code with more reliable Claude integration!

.github/workflows/version-and-publish.yml

@@ -143,18 +143,6 @@ jobs:
             COMMITS=$(git log --oneline --no-merges ${LAST_TAG}..HEAD || echo "No new commits")
           fi
 
-          # Create fallback changelog from commits
-          create_fallback_changelog() {
-            echo "## Changes"
-            echo ""
-            if [ "$COMMITS" != "No recent commits" ] && [ "$COMMITS" != "No new commits" ]; then
-              echo "### 📋 Updates"
-              echo "$COMMITS" | sed 's/^[a-f0-9]* /- /' | head -10
-            else
-              echo "### 📋 Updates"
-              echo "- Version bump and maintenance updates"
-            fi
-          }
 
           # Generate changelog using Claude (fail if it fails)
           if ! command -v claude-code >/dev/null 2>&1; then
@@ -163,7 +151,7 @@ jobs:
           fi
 
           echo "🤖 Generating changelog with Claude..."
-          CHANGELOG=$(timeout 60s claude-code << 'CLAUDE_EOF'
+          CHANGELOG=$(timeout 240s claude-code << 'CLAUDE_EOF'
 Please analyze the following git commits and generate a concise changelog in this exact format:
 
 ## Changes