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/a6-latency-multiplication/a6-latency-multiplication.svg

@@ -51,14 +51,14 @@
 </defs>
 <rect class="canvas" width="680" height="677" />
 <polyline class="edge kind-request style-solid emphasis-normal" points="146.5,131.0 146.5,179.0 146.5,179.0 146.5,227.0" data-evidence="253-263" />
-<rect class="edge-label-bg" x="131.3" y="165.0" width="78.3" height="22" rx="3" />
-<text class="edge-label" x="170.5" y="180.0">왕복마다 더해진다</text>
+<rect class="edge-label-bg" x="141.4" y="165.0" width="58.2" height="22" rx="3" />
+<text class="edge-label" x="170.5" y="180.0">왕복당 누적</text>
 <polyline class="edge kind-request style-solid emphasis-normal" points="146.5,465.0 146.5,513.0 146.5,513.0 146.5,561.0" data-evidence="264-273" />
 <rect class="edge-label-bg" x="131.3" y="499.0" width="78.3" height="22" rx="3" />
 <text class="edge-label" x="170.5" y="514.0">프로브도 타임아웃</text>
 <polyline class="edge kind-request style-solid emphasis-normal" points="146.5,298.0 146.5,346.0 146.5,346.0 146.5,394.0" data-evidence="259-268" />
-<rect class="edge-label-bg" x="121.3" y="332.0" width="98.4" height="22" rx="3" />
-<text class="edge-label" x="170.5" y="347.0">커넥션 점유가 길어진다</text>
+<rect class="edge-label-bg" x="141.4" y="332.0" width="58.2" height="22" rx="3" />
+<text class="edge-label" x="170.5" y="347.0">커넥션 점유</text>
 <g id="node-inject">
 <rect class="node-shape kind-process emphasis-warning role-source" data-evidence="253-258" x="71.5" y="60.0" width="150.0" height="71.0" rx="7" />
 <text class="node-label" x="146.5" y="87.0">주입한 지연</text>