v0.5.1

Changelog

• 9660f4c docs(changelog): cut 0.5.1 — why UX polish from first real-world runs
• 2feec0b feat(store): disambiguate same-named databases in the pick-one listing
• ad6e9ca fix(ci): windows npx smoke — virgin npm cache per attempt; wrapper hints at cache poisoning
• 2b76a01 fix(why): keep significant digits on sub-millisecond means and tiny rates
• 09c5a66 fix(why): name window truncation when older history exists