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/d2-upgrade-direction/d2-upgrade-direction.svg

@@ -51,17 +51,17 @@
 </defs>
 <rect class="canvas" width="680" height="689" />
 <polyline class="edge kind-read style-solid emphasis-normal" points="265.0,291.0 265.0,339.0 160.5,339.0 160.5,387.0" data-evidence="499-505" />
-<rect class="edge-label-bg" x="166.9" y="297.0" width="91.7" height="22" rx="3" />
-<text class="edge-label" x="212.8" y="312.0">무엇을 보고 판단하나</text>
+<rect class="edge-label-bg" x="187.0" y="297.0" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="212.8" y="312.0">판단 기준</text>
 <polyline class="edge kind-blocked style-solid emphasis-normal" points="283.0,291.0 283.0,345.5 394.5,345.5 394.5,400.0" data-evidence="492-497" />
-<rect class="edge-label-bg" x="292.9" y="303.5" width="91.7" height="22" rx="3" />
-<text class="edge-label" x="338.8" y="318.5">실패가 여기서 멈춘다</text>
+<rect class="edge-label-bg" x="313.0" y="303.5" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="338.8" y="318.5">중단 지점</text>
 <polyline class="edge kind-request style-solid emphasis-normal" points="274.0,124.0 274.0,172.0 274.0,172.0 274.0,220.0" data-evidence="483-491" />
 <rect class="edge-label-bg" x="265.6" y="158.0" width="64.9" height="22" rx="3" />
 <text class="edge-label" x="298.0" y="173.0">기동 시 검증</text>
 <polyline class="edge kind-request style-solid emphasis-normal" points="394.5,471.0 394.5,525.5 274.0,525.5 274.0,580.0" data-evidence="492-498" />
-<rect class="edge-label-bg" x="288.4" y="483.5" width="91.7" height="22" rx="3" />
-<text class="edge-label" x="334.2" y="498.5">남은 파드가 응답한다</text>
+<rect class="edge-label-bg" x="298.4" y="483.5" width="71.6" height="22" rx="3" />
+<text class="edge-label" x="334.2" y="498.5">잔여 파드 응답</text>
 <g id="node-rollback">
 <rect class="node-shape kind-process emphasis-warning role-source" data-evidence="483-490" x="199.0" y="60.0" width="150.0" height="64.0" rx="7" />
 <text class="node-label" x="274.0" y="90.0">옛 버전으로 되돌리기</text>
@@ -76,13 +76,13 @@
 <rect class="node-shape kind-datastore emphasis-primary role-support" data-evidence="499-505" x="70.0" y="400.0" width="181.0" height="71.0" /><ellipse class="node-shape kind-datastore emphasis-primary role-support" cx="160.5" cy="400.0" rx="90.5" ry="13.0" /><path class="storage-bottom" d="M 70.0 471.0 A 90.5 13.0 0 0 0 251.0 471.0" />
 <text class="node-label" x="160.5" y="427.0">databasechangelog 행 수</text>
 <line class="node-detail-divider" x1="84.0" y1="448.0" x2="237.0" y2="448.0" />
-<text class="node-detail" x="86.0" y="465.0">늘었으면 스키마가 움직였다</text>
+<text class="node-detail" x="86.0" y="465.0">전후 행 수 비교</text>
 </g>
 <g id="node-rolling">
 <rect class="node-shape kind-process emphasis-primary role-control" data-evidence="492-497" x="311.0" y="400.0" width="167.0" height="71.0" rx="7" />
 <text class="node-label" x="394.5" y="427.0">StatefulSet 롤링 업데이트</text>
 <line class="node-detail-divider" x1="325.0" y1="448.0" x2="464.0" y2="448.0" />
-<text class="node-detail" x="327.0" y="465.0">나머지 파드는 건드리지 않는다</text>
+<text class="node-detail" x="327.0" y="465.0">나머지 파드 유지</text>
 </g>
 <g id="node-service">
 <rect class="node-shape kind-service emphasis-primary role-target" data-evidence="492-498" x="199.0" y="580.0" width="150.0" height="64.0" rx="7" />