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/.techviz/measurement-control/spec.json

@@ -72,7 +72,7 @@
       "emphasis": "primary",
       "description": "대조군과 대비될 때만 성립한다.",
       "details": [
-        "대조군이 0 이므로 한 번도 갱신 탓"
+        "대조군 0 → 귀속 성립"
       ],
       "evidence": [
         {
@@ -90,7 +90,7 @@
       "emphasis": "warning",
       "description": "대조군이 없으면 여기로 간다.",
       "details": [
-        "76건 실패는 로컬 아티팩트였다"
+        "로컬 아티팩트 76건"
       ],
       "evidence": [
         {
@@ -106,7 +106,7 @@
       "id": "b-o",
       "from": "baseline",
       "to": "observation",
-      "label": "비교 기준을 준다",
+      "label": "비교 기준",
       "kind": "read",
       "evidence": [
         {
@@ -120,7 +120,7 @@
       "id": "o-a",
       "from": "observation",
       "to": "attribution",
-      "label": "대조가 있으면",
+      "label": "대조군 있음",
       "kind": "request",
       "evidence": [
         {
@@ -134,7 +134,7 @@
       "id": "o-m",
       "from": "observation",
       "to": "misreport",
-      "label": "대조가 없으면",
+      "label": "대조군 없음",
       "kind": "blocked",
       "evidence": [
         {