docs: first draft of issue and PR template

.github/ISSUE_TEMPLATE/security_vulnerability.yml

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+name: Security Vulnerability
+description: Report a security vulnerability
+title: "[SECURITY] "
+labels: ["security"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting a security vulnerability. Please review our [Security Policy](SECURITY.md) for more information on how we handle security issues.
+
+        If you are reporting a security vulnerability, please provide as much detail as possible so we can assess and address it promptly.
+
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: Brief description of the security issue.
+      placeholder: "Describe the security vulnerability in a few sentences."
+    validations:
+      required: true
+
+  - type: textarea
+    id: details
+    attributes:
+      label: Vulnerability Details
+      description: Detailed description of the vulnerability, including how it can be exploited.
+      placeholder: "Provide detailed steps, code snippets, or other information that demonstrates the vulnerability."
+    validations:
+      required: true
+
+  - type: textarea
+    id: impact
+    attributes:
+      label: Impact
+      description: What is the potential impact of this vulnerability?
+      placeholder: "Describe the potential consequences if this vulnerability is exploited."
+    validations:
+      required: true
+
+  - type: textarea
+    id: mitigation
+    attributes:
+      label: Suggested Mitigation
+      description: Any suggestions for fixing or mitigating the issue.
+      placeholder: "Provide any suggestions for how to fix or mitigate this vulnerability."
+
+  - type: input
+    id: contact
+    attributes:
+      label: Contact Information (Optional)
+      description: How can we contact you for more information?
+      placeholder: "Email address or other contact method"
+
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Terms
+      description: By submitting this issue, you agree to our responsible disclosure terms.
+      options:
+        - label: I understand that this is a private security report and will not publicly disclose details until the issue is resolved.
+          required: true