~anthropic/claude-sonnet-latest → B (70:30)

Commit B replaces an ad-hoc rule-combinator engine with a more principled semantic graph/DFA architecture for URL canonicalization, a substantive design change with lasting structural impact (even though the diff removes tests, it references new modules graph.rs/parse.rs/registry_tests.rs implying continued coverage). Commit A is a smaller correctness/clarity fix (converting a silent fallback to an explicit panic with better invariants and doc clarifications, plus added test assertions), which is valuable but narrower in scope than B's architectural overhaul.