Add a security policy and three issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a reproducible DiffBio bug
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: What went wrong?
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Minimal reproduction
+      description: Include code, commands, and any input data shape assumptions.
+      render: python
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      render: text
+    validations:
+      required: true
+  - type: input
+    id: diffbio-version
+    attributes:
+      label: DiffBio version or commit
+      placeholder: "0.1.0 or git SHA"
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Include OS, Python, JAX, jaxlib, accelerator, and installed extras.
+      render: text
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Propose a new DiffBio capability
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What user need or workflow gap should this solve?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed API or behavior
+      description: Include example code or CLI usage if possible.
+      render: python
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+    validations:
+      required: false
+  - type: textarea
+    id: validation
+    attributes:
+      label: Validation plan
+      description: What tests, docs, or examples would prove this works?
+    validations:
+      required: false

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+DiffBio is a research preview. Security fixes target the latest released version
+and the current `main` branch.
+
+## Reporting a Vulnerability
+
+Please report suspected vulnerabilities privately by emailing
+security@avitai.bio.
+
+Include:
+
+- Affected DiffBio version or commit.
+- Environment details, including Python, JAX, and operating system versions.
+- A minimal reproduction or proof of impact.
+- Any known mitigations.
+
+We will acknowledge reports as soon as practical, investigate privately, and
+coordinate disclosure once a fix or mitigation is available.
+
+## Scope
+
+Security-sensitive areas include sequence, variant and molecular file parsing, dataset and reference-genome loading, checkpoint loading, file-system storage, CI release automation, and any code path that processes untrusted biological input data.