an experimental loop under src/bernstein/evolution/ that lets bernstein propose changes to itself. metrics from past runs flow into a detector, which surfaces opportunities (slow tick, expensive task class, poor gate signal). a creative pipeline drafts a change, an approval gate routes by risk score, the eval harness runs the change against the golden suite, and only proposals that improve the baseline without regressing protected invariants are applied. an invariants guard hash-locks safety-critical files so the loop cannot edit them. circuit-breaker halts evolution on safety violation. opt-in; off by default.
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