Feature: scripts/promote.ts --mark-reviewed does not verify the ID actually exists in the journal

promote.ts --mark-reviewed just adds the given string to .promoted-ids.json with no check against a real fetched journal entry. A typo silently creates a dead tracking entry with no feedback. Low-cost fix: fetch entries first (or accept an optional --verify flag) and warn if the id is not found among current journal:index entries.

Start with scripts/promote.ts and the --mark-reviewed command path, then inspect how current journal:index entries are fetched. Try the command with an existing ID and a typo to confirm the current behavior. Done means an ID absent from the fetched entries produces clear feedback and does not create a dead tracking entry.

Written by the indexing model from the issue text.