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/a8-cache-vs-session/a8-cache-vs-session.svg

@@ -51,14 +51,14 @@
 </defs>
 <rect class="canvas" width="680" height="556" />
 <polyline class="edge kind-read style-solid emphasis-normal" points="393.0,324.0 393.0,372.0 269.0,372.0 269.0,420.0" data-evidence="270-278" />
-<rect class="edge-label-bg" x="278.4" y="330.0" width="105.1" height="22" rx="3" />
-<text class="edge-label" x="331.0" y="345.0">세션이 남아 있어 통한다</text>
+<rect class="edge-label-bg" x="305.2" y="330.0" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="331.0" y="345.0">세션 조회</text>
 <polyline class="edge kind-write style-solid emphasis-normal" points="260.0,131.0 260.0,185.5 164.0,185.5 164.0,240.0" data-evidence="270-278" />
-<rect class="edge-label-bg" x="190.0" y="143.5" width="44.0" height="22" rx="3" />
-<text class="edge-label" x="212.0" y="158.5">비운다</text>
+<rect class="edge-label-bg" x="182.9" y="143.5" width="58.2" height="22" rx="3" />
+<text class="edge-label" x="212.0" y="158.5">캐시 초기화</text>
 <polyline class="edge kind-read style-solid emphasis-normal" points="278.0,131.0 278.0,179.0 393.0,179.0 393.0,227.0" data-evidence="270-278" />
-<rect class="edge-label-bg" x="299.7" y="137.0" width="71.6" height="22" rx="3" />
-<text class="edge-label" x="335.5" y="152.0">건드리지 않는다</text>
+<rect class="edge-label-bg" x="309.8" y="137.0" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="335.5" y="152.0">변경 없음</text>
 <g id="node-restart">
 <rect class="node-shape kind-process emphasis-primary role-source" data-evidence="270-274" x="171.5" y="60.0" width="195.0" height="71.0" rx="7" />
 <text class="node-label" x="269.0" y="87.0">롤링 재시작</text>