docs: correct the places where documents contradicted their own evidence

An independent audit found ten documents printing values their evidence files do not contain. C-1 printed a session count of 0 where the evidence says 4, C-2 printed a success readback for a command that exited 1, and A-1 credited the conntrack flush with a split that the timestamps attribute to a pod restart four seconds earlier.

Also measured wal_writer_delay, which A-3 had asserted as matching without ever querying it, relabelled the A-6 control that moved 41 percent, noted A-8's nine-sample resolution, corrected D-1's RTO to the 41 seconds its own timeline shows, and added a correction banner to D-2. Every experiment document now links its evidence files with their real collection times, and the duplicate screenshots are documented as duplicates.

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

docs/experiment-b7-cookie-secret-rotation.md

@@ -255,6 +255,21 @@ B-6 에서 Keycloak 은 `kid` 로 여러 키를 구분해 무중단 회전을
 
 ---
 
+---
+
+## 증거 파일
+
+**증거 수집 시각: 2026-09-04 14:35 – 14:42 KST** (파일 mtime 기준. 문서 상단의 시각 표기는 작성 시점이라 다를 수 있다.)
+
+| 파일 | 종류 |
+|---|---|
+| [`01-deploy.txt`](evidence/b7-cookie-secret/01-deploy.txt) | 터미널 원문 |
+| [`02-cookie-portability.txt`](evidence/b7-cookie-secret/02-cookie-portability.txt) | 터미널 원문 |
+| [`03-rotation.txt`](evidence/b7-cookie-secret/03-rotation.txt) | 터미널 원문 |
+| [`b7-oauth2proxy-login-success.png`](evidence/b7-cookie-secret/b7-oauth2proxy-login-success.png) | 스크린샷 |
+
+파일별 상세는 [`evidence/b7-cookie-secret/README.md`](evidence/b7-cookie-secret/README.md).
+
 ## 6. 재현 절차 (명령어)
 
 ```bash