feat(workouts): add the activity-insight evidence projection and prompt

The evidence block is a numbers-only server projection: zone seconds, the
workout-window heart-rate shape, route climb and a same-sport 90-day own-history
median. Free-text metadata never enters it, and the sport string is narrowed
against the closed enum first, so the payload carries no text the user did not
generate through a measured field.

The prompt composes the shared assessment base and adds the session contract:
device-attributed, own-history-comparative, effort acknowledged where the
numbers show it, and no training prescriptions of any kind. Registered in the
tone harness beside the assessment cards.

scripts/rotate-encryption-key.ts

@@ -405,6 +405,17 @@ async function main() {
     ),
   );
 
+  // ───── v1.31.0 WorkoutInsight."paragraphEncrypted" (Bytes) ─────
+  // The per-workout Activity Insight paragraph. Not nullable — a row exists
+  // only where a paragraph was generated — so every scanned row rotates.
+  results.push(
+    await rotateBytesColumn(
+      "WorkoutInsight",
+      "paragraphEncrypted",
+      prisma.workoutInsight,
+    ),
+  );
+
   // ───── v1.18.1 clinical-spine notes (Bytes columns) ─────
   // "noteEncrypted" (LabResult / IllnessEpisode / IllnessDayLog) +
   // "contextEncrypted" (Biomarker). Mirror the CoachFact.factEncrypted block.