feat(backup): carry emergency profile through rotation and backup

Register the three encrypted emergency columns in the rotation registry
and the key-rotation script so a legacy-key drop cannot strand them.
Carry all six new columns through the profile backup builder and restore
(the enums by value, the free text as ciphertext in a DR payload or
decrypted plaintext in a portable export) and extend the wire schema.
The full-backup round-trip integration test seeds the six columns and
asserts each survives an export and restore.

scripts/rotate-encryption-key.ts

@@ -369,12 +369,17 @@ async function main() {
   // ───── UserHealthProfile (Bytes columns) ─────
   // "aboutMeEncrypted" "conditionsEncrypted" "allergiesEncrypted"
   // "coachFocusEncrypted" "pendingQuestionsEncrypted"
+  // "emergencyContactsEncrypted" "emergencyImplantsEncrypted"
+  // "emergencyNoteEncrypted"
   for (const field of [
     "aboutMeEncrypted",
     "conditionsEncrypted",
     "allergiesEncrypted",
     "coachFocusEncrypted",
     "pendingQuestionsEncrypted",
+    "emergencyContactsEncrypted",
+    "emergencyImplantsEncrypted",
+    "emergencyNoteEncrypted",
   ]) {
     results.push(
       await rotateBytesColumn(