feat(security): expand audit and safe --fix

SECURITY.md

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+# Security Policy
+
+If you believe you’ve found a security issue in Clawdbot, please report it privately.
+
+## Reporting
+
+- Email: `steipete@gmail.com`
+- What to include: reproduction steps, impact assessment, and (if possible) a minimal PoC.
+
+## Operational Guidance
+
+For threat model + hardening guidance (including `clawdbot security audit --deep` and `--fix`), see:
+
+- `https://docs.clawd.bot/gateway/security`
+