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.svg

@@ -50,9 +50,9 @@
   </style>
 </defs>
 <rect class="canvas" width="680" height="462" />
-<polyline class="edge kind-read style-solid emphasis-normal" points="220.0,220.5 321.0,220.5 321.0,95.5 422.0,95.5" data-evidence="143-147" />
-<rect class="edge-label-bg" x="319.2" y="144.0" width="51.5" height="22" rx="3" />
-<text class="edge-label" x="345.0" y="159.0">외부 응답</text>
+<polyline class="edge kind-read style-solid emphasis-normal" points="220.0,220.5 323.5,220.5 323.5,95.5 427.0,95.5" data-evidence="143-147" />
+<rect class="edge-label-bg" x="321.8" y="144.0" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="347.5" y="159.0">외부 응답</text>
 <polyline class="edge kind-read style-solid emphasis-normal" points="220.0,256.5 317.5,256.5 317.5,381.5 415.0,381.5" data-evidence="143-147" />
 <rect class="edge-label-bg" x="315.8" y="305.0" width="51.5" height="22" rx="3" />
 <text class="edge-label" x="341.5" y="320.0">저장 결과</text>
@@ -66,10 +66,10 @@
 <text class="node-detail" x="86.0" y="268.0">두 노드</text>
 </g>
 <g id="node-curl">
-<rect class="node-shape kind-process emphasis-normal role-target" data-evidence="143-147" x="422.0" y="60.0" width="160.0" height="71.0" rx="7" />
+<rect class="node-shape kind-process emphasis-normal role-target" data-evidence="143-147" x="427.0" y="60.0" width="150.0" height="71.0" rx="7" />
 <text class="node-label" x="502.0" y="87.0">외부 curl</text>
-<line class="node-detail-divider" x1="436.0" y1="108.0" x2="568.0" y2="108.0" />
-<text class="node-detail" x="438.0" y="125.0">분단돼도 200 이 나올 수 있다</text>
+<line class="node-detail-divider" x1="441.0" y1="108.0" x2="563.0" y2="108.0" />
+<text class="node-detail" x="443.0" y="125.0">분단 시에도 200</text>
 </g>
 <g id="node-prom">
 <rect class="node-shape kind-process emphasis-primary role-target" data-evidence="143-147" x="380.0" y="203.0" width="244.0" height="71.0" rx="7" />