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.drawio

@@ -17,7 +17,7 @@
         <mxCell id="n_probe" value="readiness 실패&lt;br/&gt;동시 20건 최대 22.2초" tooltip="느린 노드가 로드밸런서에서 빠진다. | Evidence: L269-L273" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;strokeColor=#d97706;fillColor=#fffdf5;" vertex="1" parent="1">
           <mxGeometry x="71.5" y="561.0" width="150.0" height="71.0" as="geometry"/>
         </mxCell>
-        <mxCell id="e_i-r" value="왕복마다 더해진다" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_inject" target="n_roundtrips">
+        <mxCell id="e_i-r" value="왕복당 누적" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_inject" target="n_roundtrips">
           <mxGeometry relative="1" as="geometry">
             <mxPoint x="170.5" y="179.0" as="offset"/>
           </mxGeometry>
@@ -27,7 +27,7 @@
             <mxPoint x="170.5" y="513.0" as="offset"/>
           </mxGeometry>
         </mxCell>
-        <mxCell id="e_r-p" value="커넥션 점유가 길어진다" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_roundtrips" target="n_pool">
+        <mxCell id="e_r-p" value="커넥션 점유" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_roundtrips" target="n_pool">
           <mxGeometry relative="1" as="geometry">
             <mxPoint x="170.5" y="346.0" as="offset"/>
           </mxGeometry>