ben-manes / caffeine / #5727

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Add the audit-regret skill for adversarial workload search

/audit-regret is the third leg of the climber's audit set: /audit-
adaptivity finds implementation defects and /climber-gate re-runs the
known traps, while this skill searches a compositional workload
generator for cells where the machine fails to close the gap to its
static ceiling, shrinks each to a minimal witness, finds the dose
transition, and classifies the failure (wrong equilibrium, slow
convergence, masked signal, insufficient exploration, oscillation,
memory, irreversible damage, aliasing, premature commitment, tier
discontinuity, structural) against the layer that owns it. Confirmed
families become gate rows and hill-climber.md entries.

workload.py generates a lirs trace from a JSON spec of members and
segments, regret.py measures one cell against the static-sweep anchors
and reads the harness trajectory into a signature with class hints, and
search.py screens, mutates, shrinks, bisects, and pairs specs over a
resumable CSV. CLAUDE.md, hill-climber.md, testing.md, and the gate
skill point at the new skill.

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