Fix shell quoting issue: Use JSON output instead of direct variable expansion

- Read enhanced task from JSON output using jq to avoid shell parsing issues
- Prevents 'command not found' errors when task contains quotes
- JSON is properly escaped and safe to parse

Author: htilly

.github/workflows/aicode-preprocess.yml

@@ -107,4 +107,3 @@ jobs:
             -H "Accept: application/vnd.github+json" \
             -H "Content-Type: application/json" \
             -d "$PAYLOAD"
-