docs: record v0.9.0 candidate verification

Author: aryamthecodebreaker

docs/releases/v0.9.0-verification.md

@@ -50,5 +50,5 @@ Local candidate: branch `codex/v0.9.0-impact-benchmark`, based on `c9af1e7701c5a
 - [x] Mobile 390x844 verification of `/`, `/demo`, `/product`, `/docs`, and `/evidence`, plus working mobile-menu navigation.
 - [x] Live-demo preset interaction changes the leading context to `src/email/transport.ts` while retaining the Impact Graph.
 - [x] Original user checkout remains clean and untouched on branch `0.8.7`.
-- [ ] Hosted Linux and supported-platform CI against the exact committed SHA.
+- [x] Hosted Linux and supported-platform CI against the exact committed SHA: Node 20.11 and 22 on Ubuntu, Node 24 on macOS and Windows, plus the full CI workflow.
 - [ ] Explicit release authorization received for the exact CI-verified candidate.