Show lesson marks and attendance on the person card.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/protocol.md

@@ -373,6 +373,14 @@ order as in the world and in `people.json`. Each row has `kind`, `kindLabel` (mo
 and which kinds write live on `BehaviorDef` (`offenseMemoryMax`, `offenseMemoryKinds`), not in
 the client. HTTP JSON is additive — no protocol version bump.
 
+`lessonMarks` and `attendance` are the sparse gradebook on the person (stages A/B). Same order as
+in the world and in `people.json`. Mark rows carry `subject`, `subjectLabel`, `value` (2–5),
+`time`, `period`. Attendance rows carry `subject`, `subjectLabel`, `status`
+(`present` / `late` / `absent`), `statusLabel` (mod locale), `time`, `period`, and optional
+`absenceReason` (vanilla `truancy`; illness comes later). Empty is `[]`. Ceilings live on
+`BehaviorDef` (`lessonMarkMax`, `attendanceMax`). There is **no** POST/PUT to set marks or
+attendance — guests and owners only read. The people list does not include these fields.
+
 ```json
 {
   "id": "f0.c0",
@@ -439,6 +447,26 @@ the client. HTTP JSON is additive — no protocol version bump.
       "otherFullName": "Иванов Кирилл Петрович"
     }
   ],
+  "lessonMarks": [
+    {
+      "subject": "Mathematics",
+      "subjectLabel": "Математика",
+      "value": 5,
+      "time": "2012-04-03T10:05:00Z",
+      "period": 1
+    }
+  ],
+  "attendance": [
+    {
+      "subject": "Mathematics",
+      "subjectLabel": "Математика",
+      "status": "present",
+      "statusLabel": "был",
+      "time": "2012-04-03T10:02:00Z",
+      "period": 1,
+      "absenceReason": null
+    }
+  ],
   "connections": {
     "family": {
       "parents": [
@@ -720,14 +748,20 @@ one.
       "year": 5,
       "letter": "А",
       "classTeacherId": "f3.p1",
-      "classTeacherName": "Иванова Ольга Михайловна"
+      "classTeacherName": "Иванова Ольга Михайловна",
+      "averageMark": 3.8,
+      "absentLessons": 4,
+      "frequentAbsentees": 1
     }
   ]
 }
 ```
 
 `classes` lists every homeroom with an optional class-teacher slot. `classTeacherId` /
-`classTeacherName` are null when the slot is empty. Assign and clear (below) return this same
+`classTeacherName` are null when the slot is empty. `averageMark` is the mean of recent lesson
+marks across pupils in that class (`null` when none). `absentLessons` counts absent rows in
+recent attendance memory; `frequentAbsentees` is how many pupils have at least three such
+absences — a short Management summary, not a year sheet. Assign and clear (below) return this same
 payload so the Management panel can refresh the slots without a second GET.
 
 Applicants here are the same people as in `saves/{id}.people.json`. A parent keeps the same