v0.1.3

Real, cited, no-fabrication tax data (additive, backward-compatible).

• Live EU VAT rate feed — binds the public, MIT-licensed ibericode/vat-rates dataset (a community compilation, honestly not labelled as the official EU TEDB) via IbericodeVatRateSource, composed as ChainTaxRateSource(feed → static fallback) when tax.eu_vat.enabled. Static snapshot stays the zero-config default. Reduced bands surface only from an operator-supplied category map.
• US per-state SaaS taxability — a curated StaticProductTaxability::unitedStatesSaas() map covering 40 states where two dated authoritative compilations (TaxJar + Anrok) agree, each cited in docs. The 7 conflicting/partial/home-rule states are deliberately left for the operator to configure.
• US economic-nexus thresholds — a cited StaticNexusThresholds table (Sales Tax Institute) with AND/OR combinators; UsSalesTaxRegime flags a likely obligation but nexus is still asserted by explicit registration.

Everything sourced from primary/authoritative references; undetermined jurisdictions are omitted (operator-owned), never invented. US rooftop/local rates still not shipped (documented).