fix(insights): wire grip / pain / waist / waist-to-height across web and MCP

Grip strength, pain (0–10 NRS), waist circumference, and waist-to-height
existed in the measurement enum, signal registry, and FHIR export but had
no web entry, no detail page, single non-sex-aware bands, and a split-brain
MCP exposure. This closes those gaps.

Web capture: the four signals join the manual measurement form, so a
web-only self-hoster can log them (the iOS client and the measurements API
already could).

Detail pages: flip detailPage on for the four signals and mount each on the
shared HealthKit metric template (chart, stat strip, Coach-read strip,
assessment card) via routed sub-pages and tab-strip pills, the same detail
spine every other metric carries.

Sex-aware bands: grip strength (EWGSOP2 men 27 / women 16 kg) and waist
(WHO men 94 / women 80 cm) now classify by the profile sex through the
age/sex norm resolver the assessment already threads; the resolver also
returns a sex-specific, age-independent band when no date of birth is set.
Fix the waist-to-height boundary so the NICE >= 0.5 rule is correct (the
last in-range value is 0.49).

MCP single source of truth: decouple the registry mcp facet from the Coach
snapshot — a signal can be MCP-readable without being on the Coach surface.
Mark the four physical signals mcp:true, derive the MCP rich-reads clinical
set from the registry flag instead of a duplicate allowlist, and relax the
invariant to coachSnapshot implies mcp (not the reverse). PHQ-9 / GAD-7 and
the environmental signals stay mcp:false and unreachable. compare_metric and
detect_changepoints now advertise clinical-signal support to match
get_metric_baseline.

docs/api/openapi.yaml

@@ -6086,6 +6086,10 @@ paths:
               - AVERAGE_HEART_RATE
               - MAX_HEART_RATE
               - ENERGY_EXPENDITURE_KJ
+              - GRIP_STRENGTH
+              - PAIN_NRS
+              - WAIST_CIRCUMFERENCE
+              - WAIST_TO_HEIGHT
             description: "HealthKit metric id to assess (e.g. RESTING_HEART_RATE, SLEEP_DURATION). Closed enum: an unknown id 422s.
               The seven specialised metrics are served by their own routes and are not accepted here."
           required: true
@@ -10273,7 +10277,7 @@ components:
               - order
         tiles:
           minItems: 1
-          maxItems: 50
+          maxItems: 61
           type: array
           items:
             type: object
@@ -10287,6 +10291,7 @@ components:
                   - oxygen
                   - body-temperature
                   - respiratory-rate
+                  - pain
                   - weight
                   - bmi
                   - body-water
@@ -10296,6 +10301,8 @@ components:
                   - muscle-mass
                   - visceral-fat
                   - lean-body-mass
+                  - waist
+                  - waist-to-height
                   - steps
                   - active-energy
                   - workouts
@@ -10312,6 +10319,7 @@ components:
                   - six-minute-walk
                   - stair-ascent-speed
                   - stair-descent-speed
+                  - grip-strength
                   - sleep
                   - breathing-disturbances
                   - resting-pulse
@@ -25476,7 +25484,7 @@ components:
             additionalProperties: false
         tiles:
           minItems: 1
-          maxItems: 50
+          maxItems: 61
           type: array
           items:
             type: object
@@ -25490,6 +25498,7 @@ components:
                   - oxygen
                   - body-temperature
                   - respiratory-rate
+                  - pain
                   - weight
                   - bmi
                   - body-water
@@ -25499,6 +25508,8 @@ components:
                   - muscle-mass
                   - visceral-fat
                   - lean-body-mass
+                  - waist
+                  - waist-to-height
                   - steps
                   - active-energy
                   - workouts
@@ -25515,6 +25526,7 @@ components:
                   - six-minute-walk
                   - stair-ascent-speed
                   - stair-descent-speed
+                  - grip-strength
                   - sleep
                   - breathing-disturbances
                   - resting-pulse