docs(keycloak-session-store): take the sentences out of the diagram canvases

The skill says drawings carry names and sentences go in <desc> and the
paragraph beside the figure. I put sentences in node details and edge labels
instead, and 27 of the 28 diagrams shipped with prose inside the canvas —
"예측 다섯 개가 틀렸다", "아홉 번 조용히 실패했다", "막혀서 닿지 않는다".

Only label and details render on the canvas; description does not. So every
sentence moved to a noun phrase and the meaning stays in description, which
was already carrying it.

  막혀서 닿지 않는다              -> 차단
  아홉 번 조용히 실패했다         -> 조용한 실패 9건
  예측 다섯 개가 틀렸다           -> 틀린 예측 5건
  로그아웃이 정리하지 않는다      -> 로그아웃 미정리
  볼륨이 없으면 여기까지다        -> 볼륨 없음

Three node labels were sentences too and became names: 세션 스냅샷, 예측
선기록, 대조군 확보.

What stays is what the rules protect — identifiers, commands and measured
values: PRIMARY KEY (client_registration_id, principal_name),
ValidationFailedException: 1 changesets check sum, nginx -t && nginx -s
reload, SET LOCAL synchronous_commit TO OFF. Those are names of things, not
prose about them.

294 canvas strings across 28 diagrams, none matching a sentence ending,
average 11 characters. All 28 still lint clean and re-rendered.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/keycloak-session-store/final/assets/observation-points/observation-points.excalidraw

@@ -8,7 +8,7 @@
       "type": "arrow",
       "x": 220.0,
       "y": 95.5,
-      "width": 202.0,
+      "width": 207.0,
       "height": 125.0,
       "angle": 0,
       "strokeColor": "#1e1e1e",
@@ -36,15 +36,15 @@
           125.0
         ],
         [
-          101.0,
+          103.5,
           125.0
         ],
         [
-          101.0,
+          103.5,
           0.0
         ],
         [
-          202.0,
+          207.0,
           0.0
         ]
       ],
@@ -66,7 +66,7 @@
     {
       "id": "edge-label-s-c",
       "type": "text",
-      "x": 300.0,
+      "x": 302.5,
       "y": 146.0,
       "width": 90,
       "height": 24,
@@ -372,9 +372,9 @@
     {
       "id": "node-curl",
       "type": "rectangle",
-      "x": 422.0,
+      "x": 427.0,
       "y": 60.0,
-      "width": 160.0,
+      "width": 150.0,
       "height": 71.0,
       "angle": 0,
       "strokeColor": "#1e1e1e",
@@ -402,9 +402,9 @@
     {
       "id": "node-label-curl",
       "type": "text",
-      "x": 432.0,
+      "x": 437.0,
       "y": 70.0,
-      "width": 140.0,
+      "width": 130.0,
       "height": 51.0,
       "angle": 0,
       "strokeColor": "#1e1e1e",
@@ -430,11 +430,11 @@
       "locked": false,
       "fontSize": 15,
       "fontFamily": 5,
-      "text": "외부 curl\n분단돼도 200 이 나올 수 있다",
+      "text": "외부 curl\n분단 시에도 200",
       "textAlign": "center",
       "verticalAlign": "middle",
       "containerId": null,
-      "originalText": "외부 curl\n분단돼도 200 이 나올 수 있다",
+      "originalText": "외부 curl\n분단 시에도 200",
       "autoResize": true,
       "lineHeight": 1.25
     },