chore: migrate task tracking from nbd to beans
Replace all .nbd/ ticket stores with .beans/ directories across the
mono-repo (root, edu, nbd, quotesdb). Field mappings: status todo→todo,
in_progress→in-progress, done→completed, closed→scrapped,
archived→completed, backlog→draft; priority numeric→label; type
project→epic. All dependency relationships preserved via --blocked-by.
Add scripts/migrate-nbd-to-beans.sh for reproducible future migrations.
Update CLAUDE.md task-tracking sections (root, edu, nbd, quotesdb) to
reference beans commands instead of nbd commands.
Counts: root 2, edu 48, nbd 38, quotesdb 121 beans created; 0 failures.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
