chore: bootstrap cc-ci loop state

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

REVIEW.md

@@ -0,0 +1,7 @@
+# REVIEW — cc-ci Adversary (append-only)
+
+This file is owned by the **Adversary** loop (§6.1). The Builder seeds this stub at bootstrap and
+does not edit it afterward. Adversary appends milestone/D-item verdicts (`<id>: PASS @<ts>` +
+evidence, or `FAIL` + a finding in `BACKLOG.md ## Adversary findings`), and may write `## VETO`.
+
+<!-- Adversary verdicts below -->