Add stewardship readiness asset: docs/SECURITY_REVIEW.md

docs/SECURITY_REVIEW.md

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+# Security Review
+<!-- stewardship-standard: security-review-v1 -->
+
+## Required Checks
+
+- [ ] No credentials, tokens, cookies, API keys, private keys, or session files.
+- [ ] No private user data, dumps, card data, logs, or captures that should not be stored.
+- [ ] No copied dependency trees where package managers or SDK installers should be used instead.
+- [ ] No unexplained binaries in source history.
+- [ ] Risky behavior is documented and scoped to authorized lab use.
+
+## Release Gate
+
+A release is blocked until the checklist is complete or a maintainer explicitly records why the item does not apply.