Epic: AMS-side calibration loop over the miner's own event ledger (reusing the #8082 engine primitives)

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Problem

Epic #8082 gave ORB a full self-measuring calibration loop (capture → labeled corpus → backtests → track record → trend → bounded self-loosening). AMS has nothing equivalent: miner nodes keep rich local ledgers (laptop-state.sqlite3, event-ledger.sqlite3 — opportunity selection, plan/execution outcomes, governor chokepoint decisions, PR results) but none of it feeds a calibration loop, so AMS's own deterministic knobs (opportunity ranking weights, governor thresholds, deny-hook synthesis bounds) are tuned by hand and never validated against the node's real outcome history.

Proposal (epic — decompose before building, mirroring #8082's own structure)

• Corpus: pair each miner decision (opportunity taken / skipped, plan chosen, governor verdict) with its realized outcome (PR merged / closed / gate verdict) from the node's own event ledger — the AMS analog of calibration: pure BacktestCase corpus builder from RuleFiredEvent/HumanOverrideEvent pairs #8083.
• Reuse, don't rebuild: @loopover/engine's calibration primitives (buildBacktestCorpus, scoreBacktest, compareBacktestScores, splitBacktestCorpus, the render) are storage-agnostic and already shipped — the AMS work is adapters over the miner ledger, not new math.
• Backtest a knob change (e.g. an opportunity-ranker weight) against the node's recorded history before it takes effect; same Pareto-floor discipline, same advisory-first posture, same hard-bounded self-adjustment as Epic: validated auto-loosening for auto-tune.ts's tuning advisor, gated on a clean backtest #8121 if ever approved.
• Fully local: a node's corpus never leaves the node (consistent with AMS's privacy posture); fleet-level aggregation, if ever, goes through the existing federated surfaces as a separate decision.

Deliverables

Deliberately none yet — this epic needs decomposition against the actual miner-ledger schemas first (mirror how #8082 was decomposed before any code).

Links & Resources

#8082 (the ORB template for this loop), packages/loopover-engine/src/calibration/** (the shared primitives), packages/loopover-miner/lib/** (governor/opportunity/ledger surfaces)

Boundaries

Nothing autonomous without its own explicit approval gate, mirroring #8121's discipline. No cross-node data movement.

maintainer-only — epic; decompose before building.

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JSO-5678