/extract

Short name for bank / source extraction.

Do this

1. Load and execute extract-bank-statement
   (bookkeeping-accounting/skills/extract-bank-statement/SKILL.md).
2. Prefer CSV; use Maybank adapter for Maybank Islamic PDFs; fail loud on balance breaks.
3. Write workpapers/transactions.json (+ xlsx if requested) and update source register.

Done when: extract skill Done when is met.

See shared/slash-surface.md.