Move the inline CREATE TABLE IF NOT EXISTS schema_migrations from Go
code into a dedicated 000_bootstrap.sql file, following the sneak/pixa
pattern. The bootstrap SQL is executed directly before the migration
loop, which now starts from 001+. The bootstrap file also handles its
own INSERT OR IGNORE so the Go code does zero inserts for version 0.
closes#91
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
