feat(insights): derived framing for additive HealthKit metrics

Register four new derived metrics for the additive HealthKit signals:

- WRIST_TEMPERATURE_BASELINE, STAIR_ASCENT_SPEED_BASELINE,
  STAIR_DESCENT_SPEED_BASELINE — any-user-baseline personal bands reusing
  the type-generic median +/- k*MAD engine via a new BASELINE_CAPABLE_TYPES
  allowlist. Wrist temperature is a personal-deviation band only (no illness
  or cycle inference); stair speeds are personal trend bands (no population
  cutoff, geometry-confounded).
- SIX_MINUTE_WALK_BAND — passthrough re-frame placing the device-estimated
  distance against the Enright & Sherrill 1998 predicted 6MWD (ATS 2002
  test standard), as percent-of-predicted with a green/yellow/red band;
  band null when age/height/weight/sex are incomplete.

Fall count and the breathing-disturbance index stay trend-only by design,
documented in the registry: fall count is a zero-inflated discrete safety
event, the breathing index is a regulated screening signal where a derived
band would imply a diagnosis.

Note wrist temperature as a deferred correlation outcome channel held
pending a privacy review (cycle-phase inference risk), mirroring the
medication-compliance omission note.

Add provenance + standards entries, method/caveat copy across all six
locales, and tests for the engine routing, the Enright equation, and the
percent-of-predicted band.

src/components/insights/derived/standards.ts

@@ -128,4 +128,40 @@ export const METRIC_PROVENANCE: Record<DerivedMetricId, MetricProvenanceMeta> =
     },
     caveatKey: "insights.derived.composite.STRAIN_SCORE.caveat",
   },
+  WRIST_TEMPERATURE_BASELINE: {
+    methodKey: "insights.derived.composite.WRIST_TEMPERATURE_BASELINE.method",
+    standard: {
+      // Robust personal-deviation band via the median ± k·MAD.
+      name: "Leys et al. 2013, J. Exp. Soc. Psychol.",
+      url: "https://doi.org/10.1016/j.jesp.2013.03.013",
+    },
+    caveatKey: "insights.derived.composite.WRIST_TEMPERATURE_BASELINE.caveat",
+  },
+  STAIR_ASCENT_SPEED_BASELINE: {
+    methodKey: "insights.derived.composite.STAIR_ASCENT_SPEED_BASELINE.method",
+    standard: {
+      // Robust personal-trend band via the median ± k·MAD.
+      name: "Leys et al. 2013, J. Exp. Soc. Psychol.",
+      url: "https://doi.org/10.1016/j.jesp.2013.03.013",
+    },
+    caveatKey: "insights.derived.composite.STAIR_ASCENT_SPEED_BASELINE.caveat",
+  },
+  STAIR_DESCENT_SPEED_BASELINE: {
+    methodKey: "insights.derived.composite.STAIR_DESCENT_SPEED_BASELINE.method",
+    standard: {
+      // Robust personal-trend band via the median ± k·MAD.
+      name: "Leys et al. 2013, J. Exp. Soc. Psychol.",
+      url: "https://doi.org/10.1016/j.jesp.2013.03.013",
+    },
+    caveatKey: "insights.derived.composite.STAIR_DESCENT_SPEED_BASELINE.caveat",
+  },
+  SIX_MINUTE_WALK_BAND: {
+    methodKey: "insights.derived.composite.SIX_MINUTE_WALK_BAND.method",
+    standard: {
+      // Enright & Sherrill 1998 reference equations (ATS 2002 test standard).
+      name: "Enright & Sherrill 1998, Am. J. Respir. Crit. Care Med.",
+      url: "https://doi.org/10.1164/ajrccm.158.5.9710086",
+    },
+    caveatKey: "insights.derived.composite.SIX_MINUTE_WALK_BAND.caveat",
+  },
 };