~x-ai/grok-latest → A (2:1)

Side A replaces ad-hoc URL combinators (engine.rs ParsedUrl pipeline and per-domain normalize_* functions) with a graph/DFA-based canonicalization API wired through registry (graph(), resolve_canonical, breadcrumbs), which is lasting core domain design. Side B is valuable cleanup—dropping _legacy_commit_row/_legacy_observation and GitDiscovery projections so epoch/commit pages use Evidence only—but it mainly removes compatibility paths and tightens Emission fields rather than adding new capability.