openai/gpt-chat-latest → B (3:2)

Side B removes the legacy GitDiscovery projection path and makes evidence pages rely exclusively on Evidence envelopes, simplifying commit/epoch rendering, eliminating fallback code, and tightening the Emission schema by requiring evidence metadata fields instead of optional defaults. Side A adds a useful UI feature—a garden ranking copy button with markdown generation, routing, and tests—but it is primarily an end-user convenience rather than a foundational architectural cleanup.