Part 6 (finale) of Retrieval-Augmented Self-Recall. Code: RE-call. Part 5: the gap threshold that didn't transfer.
I fine-tuned the embedder on my own domain expecting a win. I measured it properly, on held-out queries.
The improvement was exactly zero. Δ+0.00 MRR. Δ+0.00 nDCG@10. Not "small". Not "within noise". Zero.
It's also the result I wanted, which takes some explaining. That's the first half of this post. The second half is how the whole engine ships, so an agent can actually use it.
The fine-tune that did nothing
