docs: add architecture diagrams for the three follow-up experiments

Each of A-7a, B-7a and D-4a had the concepts, procedure, commands and terminal evidence but no diagram, which the rest of the series carries. a7a-cache-temperature.svg the three cache states and the SQL each issues b7a-orphan-lifecycle.svg ticket structure, accumulation across two rotations, and why TTL is the only signal d4a-hook-timeline.svg the 38m25s gap against the 1-2s one, on one axis Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-04 21:37:00 +09:00
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@@ -9,6 +9,14 @@ B-7 이 **「★ 지우지 못했다」** 로 남긴 자리를 잰다.

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+## 구조
+
+![B-7a — 고아 세션의 발생·누적·정리](diagrams/b7a-orphan-lifecycle.svg)
+
+> 다이어그램 규약은 [`diagrams/_style.md`](diagrams/_style.md).
+
+---
+
 ## 0. 결론부터

 | 물음 | 답 |