chore: add the org SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Reporting A Vulnerability
+
+Do not report vulnerabilities in public issues, pull requests, discussions, or
+commit comments.
+
+Report suspected vulnerabilities privately to:
+
+- `security@jorisjonkers.dev`
+
+Include:
+
+- affected repository and commit, tag, or version
+- concise impact description
+- reproduction steps or proof of concept
+- relevant logs with secrets and private data removed
+
+## Handling
+
+Security reports are reviewed privately. Public disclosure, issue creation, and
+fix details are coordinated by Joris Jonkers after the risk is understood and a
+remediation path exists.
+
+## Supported Code
+
+Only the current default branch and actively released packages or images are in
+scope. Archived repositories, old branches, and historical tags are not
+supported unless Joris Jonkers explicitly says otherwise.
+
+## Source Availability
+
+Public visibility does not grant permission to use, copy, modify, deploy,
+redistribute, or derive from this code. Repository licensing is governed by the
+root `LICENSE` file.