Versioned rules, anchored facts, and open data

Three structural upgrades. First: rules now carry their history in the data itself — where we've verified a superseded rule, the city page shows 'Previously: … changed by [ordinance, date]' right under the current rule (nine facts to start: Seattle's FAR change, Bellevue's DADU legalization, Everett's and Boulder's owner-occupancy removals, Denver's rezoning-era end and parking repeal, Tacoma's 2019 parking elimination, Colorado Springs' height cut, Lakewood's 2024 size increase). Second: every rule row is now individually addressable (aduledger.com/wa/seattle#coverage). Third: the full corpus is downloadable at /data as JSON and CSV under CC BY 4.0 — use it, cite us.