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/b4-header-trust-boundary/b4-header-trust-boundary.svg

@@ -50,35 +50,35 @@
   </style>
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-<rect class="edge-label-bg" x="207.8" y="178.0" width="51.5" height="22" rx="3" />
-<text class="edge-label" x="233.5" y="193.0">위조 헤더</text>
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-<text class="edge-label" x="233.5" y="360.0">지우지 않으면 그대로 지난다</text>
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-<rect class="edge-label-bg" x="207.8" y="512.0" width="51.5" height="22" rx="3" />
-<text class="edge-label" x="233.5" y="527.0">인가 헤더</text>
+<polyline class="edge kind-request style-solid emphasis-normal" points="167.5,144.0 167.5,192.0 167.5,192.0 167.5,240.0" data-evidence="393-400" />
+<rect class="edge-label-bg" x="165.8" y="178.0" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="191.5" y="193.0">위조 헤더</text>
+<polyline class="edge kind-request style-solid emphasis-normal" points="167.5,311.0 167.5,359.0 167.5,359.0 167.5,407.0" data-evidence="393-400" />
+<rect class="edge-label-bg" x="155.7" y="345.0" width="71.6" height="22" rx="3" />
+<text class="edge-label" x="191.5" y="360.0">미삭제 시 통과</text>
+<polyline class="edge kind-request style-solid emphasis-normal" points="167.5,478.0 167.5,526.0 167.5,526.0 167.5,574.0" data-evidence="393-408" />
+<rect class="edge-label-bg" x="165.8" y="512.0" width="51.5" height="22" rx="3" />
+<text class="edge-label" x="191.5" y="527.0">인가 헤더</text>
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-<text class="node-label" x="209.5" y="137.0">밖에서 보낸 위조 헤더</text>
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 <g id="node-nginx">
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-<text class="node-detail" x="86.0" y="305.0">proxy_set_header ... &quot;&quot; 로 먼저 지워야 한다</text>
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-<text class="node-detail" x="145.5" y="472.0">--set-xauthrequest</text>
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+<text class="node-label" x="167.5" y="434.0">oauth2-proxy</text>
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+<text class="node-detail" x="103.5" y="472.0">--set-xauthrequest</text>
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 <g id="node-app">
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-<text class="node-label" x="209.5" y="601.0">앱</text>
-<line class="node-detail-divider" x1="148.5" y1="622.0" x2="270.5" y2="622.0" />
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+<text class="node-detail" x="108.5" y="639.0">로그인 시점 스냅샷</text>
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