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/b3-rotation-contention/b3-rotation-contention.svg

@@ -54,8 +54,8 @@
 <rect class="edge-label-bg" x="218.2" y="178.0" width="51.5" height="22" rx="3" />
 <text class="edge-label" x="244.0" y="193.0">동시 도착</text>
 <polyline class="edge kind-blocked style-solid emphasis-normal" points="220.0,471.0 220.0,519.0 220.0,519.0 220.0,567.0" data-evidence="378-384" />
-<rect class="edge-label-bg" x="194.8" y="505.0" width="98.4" height="22" rx="3" />
-<text class="edge-label" x="244.0" y="520.0">세션이 없으니 못 쓴다</text>
+<rect class="edge-label-bg" x="218.2" y="505.0" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="244.0" y="520.0">사용 불가</text>
 <polyline class="edge kind-blocked style-solid emphasis-normal" points="220.0,311.0 220.0,359.0 220.0,359.0 220.0,407.0" data-evidence="378-384" />
 <rect class="edge-label-bg" x="201.5" y="345.0" width="85.0" height="22" rx="3" />
 <text class="edge-label" x="244.0" y="360.0">경쟁 감지 시 삭제</text>