~anthropic/claude-sonnet-latest → B (6:4)

Side B fixes a real performance problem (scan no longer does a full state replay with rank centrality on every ingest), adds a genuinely new debugging capability (`compile --ingest` to replay-and-compile a single event), and includes new test coverage validating parse-error surfacing. Side A is a solid but more cosmetic feature (fullscreen layout, sorted edge-history list, preview morph) accompanied by large repetitive CSS duplication across three theme files, offering less durable engineering value per line changed.