Update replay, audit, and backtest for multi-card picks

## Problem

Replay, audit, and backtest records store one chosen card and use Quick Draft 14/42 arithmetic. Pick-Two would lose one selected card, misstate progress, and make singular actual-versus-recommended comparisons ambiguous.

## Proposed change

Carry draft format and selected-card collections through replay output, audit records, and backtest reconstruction. Define recommendation-following semantics for one-card and two-card logical picks without adding pair-optimization.

## Acceptance Criteria

- [ ] Replay output identifies the draft format and includes every card selected at each coordinate.
- [ ] Audit records preserve multi-card choices without changing coordinate identity.
- [ ] Backtest reconstructs logical picks and pool growth without equating pick count to card count.
- [ ] Recommendation-following semantics are deterministic for one-card and two-card picks.
- [ ] Existing Quick Draft golden output is intentionally migrated and remains deterministic.
- [ ] Focused replay/audit/backtest tests and the changelog cover every format.

## Scope notes

No scoring-model changes, UI work, or historical-data pipeline changes.

Locate the replay, audit, and backtest record and reconstruction code, then inspect the existing Quick Draft golden-output and focused tests to trace how a single selected card is represented. Update the formats and deterministic recommendation-following behavior for one-card and two-card picks, preserving coordinate identity and pool growth; done means every acceptance criterion is covered by focused tests and the changelog.

Written by the indexing model from the issue text.