README feedback examples are silent no-ops — feedbackId is undocumented #21

Follow-up to #15 (thx for that fix — the loop does work now when driven via SearchOptions.feedbackId).

Problem: the README still teaches the old, broken pattern in all examples:

• L45: backend.recordFeedback(results[0].id, 0.9);
• L76: db.recordFeedback(hits[0].id, 1.0);

recordFeedback() looks up the trajectory by the feedbackId passed to searchAsync(q, k, { feedbackId }). A document id never matches, and the miss returns silently — so anyone coding from the README gets a no-op learning loop with no error. feedbackId currently appears nowhere in README or docs/ (grep on alpha.20).

Suggested:

1. Update the README examples to the feedbackId flow.
2. Document that recordFeedback() with an unknown id is ignored — or better, make that case throw/warn. A silent no-op on the headline feature is rough.

Also: #13 / #14 are fixed by #15 but still sitting open — they can be closed.