replay: policy override doesn't propagate through runFromEvent

[Dexploarer]

What I tried

Replay a captured run with a stricter policy to demonstrate the "what if Guard had been tougher" workflow the README pitches.

const replay = runFromEvent({
  ledger,
  eventId,
  // overrides: ...      ← only memory-related overrides documented
  // policy: tighten(...) ← exported but the README example never wires it through
});
const diff = diffReplayAgainstOriginal(ledger, replay);

What broke

Even with tighten(demoPolicy, { deny: [...] }) passed, the diff comes back with every entry tagged identical. The override doesn't change verdicts during replay.

Expected

The README's "hero diff" section explicitly shows require_approval (constrain) → allow flipping under a stricter policy. That capability needs a tested path through runFromEvent + diffReplayAgainstOriginal.

Repro

/tmp/actantdb-real-project/replay-override.mjs.