Fetch Abstract to KB

Core Goal

• Reuse the same PostgreSQL connection env variables as fetch-meta-to-kb.
• Select rows whose abstract is empty and order by newest created_at first.
• Open https://doi.org/<doi> in OpenClaw Browser and extract abstract text.
• Write back only when the row is still empty at update time.
• Default to dry run; require explicit --apply to write.

Required Environment

• KB_DB_HOST
• KB_DB_PORT
• KB_DB_NAME
• KB_DB_USER
• KB_DB_PASSWORD
• KB_LOG_DIR (required run log directory)

Workflow

1. Run local self-test first (no DB/browser required):