Initial ChronoSeal release

SECURITY.md

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+# Security Policy
+
+## Reporting Vulnerabilities
+
+Please do not disclose security vulnerabilities publicly before responsible disclosure.
+
+Contact maintainers privately with:
+- reproduction steps
+- affected versions
+- impact assessment
+- proof-of-concept if applicable
+
+## Scope
+
+ChronoSeal intentionally operates as:
+- anti-automation middleware
+- behavioral attestation layer
+- cryptographic continuity verifier
+
+Security hardening evolves continuously.