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The other half of the bargain in milestone 416 step 4. The model moves these dials; this is what makes that reviewable rather than merely automatic. THE HOLE THIS CLOSES Every retrieval floor is an ordinary settings key, and `/api/settings` accepts any key at all. A floor written through it landed correctly and recorded nothing — a tuning history with holes in it, which is worse than no history because it reads as complete. So the generic endpoint now routes registry-owned keys through `set_dial` instead of writing them as plain rows. ROUTED, not refused: refusing would only work for callers that had been updated, while this way the form, a script, and an old client all leave the trail, and there is no version of "forgot to use the other endpoint". Clearing a control is written as an explicit set back to the shipped default, because the operator reverting something is the single most important move this history can record. `set_dial` now also refuses to record a no-op. The Settings form re-sends every field on every save, so without that one press of Save would write six rows saying the operator set six dials to the numbers they were already on — and a history nobody can skim is one nobody reads. WHAT THE OPERATOR GETS `/api/retrieval/surfaces`, `/surfaces/<name>` and `/tuning-history`, with `actor` fixed server-side rather than taken from the payload: a payload-supplied actor would let a model claim to be the operator, and "did I do this, or did the session?" is the first question this list is asked. In Settings: the five missing BUDGETS (until now only auto-inject had one, so the only control over a noisy surface was to raise its bar — which discards that surface's best candidates along with its worst), and a "What has been tuned" panel showing each change, who made it, and the reason given. The operator's own changes are marked. The MCP tool demands a reason; these endpoints do not. That asymmetry is deliberate and stated in routes/retrieval.py: the requirement exists to make the MODEL read the records before moving a number on someone else's behalf, and the operator is that someone — a mandatory justification box on every control would be friction charged to the one participant who owes no explanation. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy