docs: fill the untested items and record why the B layer has no graphs

The forward upgrade to 26.7.3 was zero downtime across 87 samples, and since databasechangelog stayed at 210 the rollback to 26.7.0 also succeeded, which narrows D-2's conclusion: rolling back fails when the schema moved, not because of the version number. The row count is the check.

Role changes never reach the upstream through request repetition; the session is a snapshot taken at login and only a new session picks up the new claim. Auditing the docs also surfaced that Prometheus scrapes only keycloak, kubelet, node-exporter and itself, so the B-layer experiments have no metrics to screenshot rather than missing screenshots.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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co-authored by Claude Opus 5
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# 다이어그램 규약
| 표현 | 뜻 |
|---|---|
| 실선 상자 | 살아 있는 구성 요소 |
| 붉은 점선 상자 | 이 실험에서 죽이거나 막은 것 |
| ✂ 붉은 X | 주입 지점 |
| 실선 화살표 | 정상 경로 |
| 붉은 점선 화살표 | 실험에서 깨진 경로 |
| 회색 글씨 | 측정값 |
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