docs(keycloak-session-store): remake all 28 diagrams through the techviz pipeline

The originating repository's SVGs were drawn by hand and every one of them
put a title, a subtitle and an explanation band inside the canvas. This
repository forbids both, so they could not be carried over — the whole set
was rebuilt through the skill's pipeline instead.

Each diagram went through prepare, references, prompt, a VizSpec 1.1 citing
document line ranges, lint, and render. All 28 pass lint and produce the
same eight formats the existing keycloak project has. Sentences moved out of
the canvas into <desc> and the paragraph beside each figure; the drawings
carry names only.

Two lint rules did real work rather than formatting work:

  edge-through-node                  caught arrows crossing an unrelated
                                     node and implying an adjacency that
                                     does not exist — four diagrams had to
                                     be restructured, not just relaid out
  evidence-outside-prepared-context  caught a diagram citing another
                                     section; its anchor moved from B-0 to
                                     B-1 so all three sections it draws on
                                     are inside the prepared context

lab-topology also had to change profile: its context offers a different
candidate set, and query-fanout with shard roles is what the section
actually shows — one entry point spreading to two Keycloak nodes.

The document now carries all 28 inline, one per claim that needed one, and
the section recording what was still missing is updated: the diagram gap is
closed, Studio records remain.

verify-pipeline.py passes. audit-records.py reports no issues.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/keycloak-session-store/final/assets/a8-cache-vs-session/a8-cache-vs-session.d2

@@ -0,0 +1,18 @@
+# 재시작이 지우는 것과 남기는 것
+# Question: 롤링 재시작 뒤에도 로그인이 유지되는 이유는 무엇인가
+direction: down
+n0: "롤링 재시작" {
+  shape: rectangle
+}
+n1: "Infinispan sessions 캐시" {
+  shape: rectangle
+}
+n2: "PostgreSQL 세션 행" {
+  shape: cylinder
+}
+n3: "재시작 전 발급한 refresh token" {
+  shape: rectangle
+}
+n0 -> n1: "비운다"
+n0 -> n2: "건드리지 않는다"
+n2 -> n3: "세션이 남아 있어 통한다"