~anthropic/claude-sonnet-latest → B (85:15)

Side B removes a significant chunk of legacy dual-path projection logic (GitDiscovery-based commit/epoch rendering), simplifying the codebase to a single Evidence-envelope model, with corresponding test updates and required-field cleanup in the Emission dataclass — a substantive architectural simplification. Side A is a small, purely cosmetic HTML/view tweak (removing a heading and reordering a div) with no functional or structural impact.