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

B delivers concrete, verifiable improvements: it fixes scan to avoid a full reducer replay (real perf win), surfaces actual DSL parse error text instead of a vague reason, adds a genuinely new capable feature (compile --ingest for single-event replay), and ships a matching test plus README docs. A's diff mostly deletes the old engine.rs and rewires registry.rs to a 'graph' module that isn't shown in this patch (graph.rs/parse.rs), so its net effect and correctness can't be fully assessed from what's presented, and it drops the existing test suite without showing replacements inline.