fix(medications): widen the medication-effect intervals to a week of lag

The automatic Newey-West rule gives a lag of 3 on 30 to 270 daily
values, which leaves most of a physiological series' carry-over out of
the intervals. The lag is now at least 7. Reference values are
recomputed with statsmodels at the new default, and the lag-3 values
stay pinned with an explicit lag. A fit whose residual autocorrelation
exceeds 0.5 is flagged, and the card, the clinician view and the PDF
say the ranges may still be too narrow.

docs/api/openapi.yaml

@@ -54898,12 +54898,18 @@ components:
                                 type: integer
                                 minimum: -9007199254740991
                                 maximum: 9007199254740991
+                                description: "Newey–West lag applied: the automatic rule, at least 7 (a week of daily carry-over)."
+                              autocorrelationCaveat:
+                                type: boolean
+                                description: "True when the lag-1 residual autocorrelation exceeds 0.5: the carry-over is strong enough that the
+                                  intervals may still be too narrow, and the read-out says so."
                             required:
                               - n
                               - df
                               - rSquared
                               - residualAutocorrelation
                               - hacLag
+                              - autocorrelationCaveat
                             additionalProperties: false
                           - type: "null"
                       confounders: