Add GitHub issue and pull request templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a reproducible problem with SIA.
+title: "[Bug]: "
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping improve SIA. Please include enough detail for maintainers to reproduce the issue.
+
+        Do not include API keys, secrets, private task data, or other sensitive information in this report.
+
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: Briefly describe the problem.
+      placeholder: SIA fails when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce
+      description: Provide the smallest set of steps or commands needed to reproduce the issue.
+      placeholder: |
+        1. Install with ...
+        2. Run ...
+        3. Observe ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: What did you expect to happen?
+      placeholder: I expected SIA to...
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      description: What actually happened?
+      placeholder: Instead, SIA...
+    validations:
+      required: true
+
+  - type: input
+    id: sia-version
+    attributes:
+      label: SIA version
+      description: Include the package version, commit SHA, or branch you are using.
+      placeholder: sia-agent 0.5.1, main@abc1234, etc.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: install-method
+    attributes:
+      label: Installation method
+      options:
+        - pip install sia-agent
+        - pip install -e ".[dev]"
+        - source checkout
+        - other
+    validations:
+      required: true
+
+  - type: input
+    id: python-version
+    attributes:
+      label: Python version
+      placeholder: Python 3.11.9
+    validations:
+      required: true
+
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      placeholder: Ubuntu 24.04, macOS 15, Windows 11, etc.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: agent-impl
+    attributes:
+      label: Agent implementation
+      description: Select the agent implementation involved, if applicable.
+      options:
+        - claude
+        - openhands
+        - pydantic-ai
+        - not sure / not applicable
+    validations:
+      required: false
+
+  - type: input
+    id: model-provider
+    attributes:
+      label: Model/provider
+      description: Include the model/provider if relevant. Do not include API keys.
+      placeholder: anthropic/claude-..., openai/..., gemini/..., etc.
+    validations:
+      required: false
+
+  - type: input
+    id: task
+    attributes:
+      label: Task
+      description: Include the bundled task or external task directory if relevant.
+      placeholder: gpqa, lawbench, longcot-chess, spaceship-titanic, ./my-task
+    validations:
+      required: false
+
+  - type: input
+    id: sandbox
+    attributes:
+      label: Sandbox mode
+      description: Include the sandbox mode if relevant.
+      placeholder: --sandbox docker, --sandbox none, not applicable
+    validations:
+      required: false
+
+  - type: textarea
+    id: command
+    attributes:
+      label: Command or code
+      description: Paste the command or minimal code that triggered the issue.
+      render: shell
+      placeholder: sia run --task gpqa --max_gen 3 --run_id 1
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs or error output
+      description: Paste relevant logs or traceback output. Remove secrets, API keys, and private data.
+      render: text
+    validations:
+      required: false
+
+  - type: textarea
+    id: extra-context
+    attributes:
+      label: Additional context
+      description: Add any other context, links, screenshots, or notes that may help.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Security report
+    url: https://github.com/hexo-ai/sia/blob/main/SECURITY.md
+    about: Please do not report security vulnerabilities in public issues. Review SECURITY.md for the appropriate reporting path.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an improvement, new capability, or new task for SIA.
+title: "[Feature]: "
+labels:
+  - enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting an improvement to SIA. For larger changes, please describe the use case and proposed behavior before starting implementation work.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or use case
+      description: What problem would this solve, or what workflow would this improve?
+      placeholder: I want to use SIA to...
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: Describe the behavior, API, CLI option, task support, documentation, or workflow you would like to see.
+      placeholder: Add support for...
+    validations:
+      required: true
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Area
+      description: Which part of the project does this most closely affect?
+      options:
+        - CLI / user workflow
+        - agent implementation
+        - provider/model configuration
+        - task authoring
+        - evaluation
+        - web visualizer
+        - documentation
+        - packaging / installation
+        - security / sandboxing
+        - other
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Are there workarounds or alternative approaches?
+      placeholder: Currently this can be worked around by...
+    validations:
+      required: false
+
+  - type: textarea
+    id: implementation
+    attributes:
+      label: Implementation notes
+      description: Share any implementation ideas, relevant files, or compatibility concerns.
+      placeholder: This may involve...
+    validations:
+      required: false
+
+  - type: dropdown
+    id: contribution
+    attributes:
+      label: Are you interested in contributing this?
+      options:
+        - Yes, I can open a PR
+        - Maybe, with maintainer guidance
+        - No, I am only suggesting the idea
+    validations:
+      required: false
+
+  - type: textarea
+    id: extra-context
+    attributes:
+      label: Additional context
+      description: Add links, examples, screenshots, related issues, or other context.
+    validations:
+      required: false

.github/pull_request_template.md

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+## Summary
+
+Describe what this pull request changes and why.
+
+## Type of change
+
+Select all that apply:
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation
+- [ ] New or updated task
+- [ ] Evaluation change
+- [ ] Provider/model configuration
+- [ ] Security-sensitive change
+- [ ] Refactor / maintenance
+- [ ] Other
+
+## Related issue
+
+Closes #
+
+## What changed
+
+- 
+- 
+- 
+
+## How I tested this
+
+Include the commands you ran and any relevant manual testing.
+
+```bash
+
+```
+
+## Security and privacy checklist
+
+- [ ] This change does not log API keys, secrets, private task data, or generated credentials.
+- [ ] This change does not weaken sandboxing, subprocess isolation, or task data boundaries.
+- [ ] Security-sensitive behavior is explained in the PR description.
+- [ ] Not applicable.
+
+## Documentation checklist
+
+- [ ] I updated README.md, CONTRIBUTING.md, SECURITY.md, or docs files as needed.
+- [ ] I added or updated examples where helpful.
+- [ ] Documentation is not needed for this change.
+
+## Contributor checklist
+
+- [ ] I ran the relevant tests.
+- [ ] I ran linting and formatting checks.
+- [ ] I kept the PR focused on one logical change.
+- [ ] I reviewed my own diff before requesting review.