Add issue and PR templates

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug report
+description: Report something that is not working as expected.
+title: "bug: "
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the problem clearly and concisely.
+      placeholder: What happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: What did you expect to happen?
+      placeholder: I expected...
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Provide the steps needed to reproduce the issue.
+      placeholder: |
+        1. Go to ...
+        2. Click on ...
+        3. Enter ...
+        4. See error ...
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Include any relevant environment information.
+      placeholder: |
+        OS: macOS 15
+        Browser: Chrome 140
+        Version/commit: v1.4.2
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs or screenshots
+      description: Add relevant logs, stack traces, screenshots, or other evidence.
+      render: shell
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: Add anything else that may help us understand the issue.
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Before submitting
+      options:
+        - label: I searched existing issues and did not find a duplicate.
+          required: true
+        - label: I have provided enough information to reproduce the issue.
+          required: true

.github/ISSUE_TEMPLATE/chore.yml

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+name: Chore
+description: Track maintenance, cleanup, refactoring, or internal work.
+title: "chore: "
+labels:
+  - chore
+body:
+  - type: dropdown
+    id: type
+    attributes:
+      label: Chore type
+      options:
+        - Refactoring
+        - Documentation
+        - Dependencies
+        - CI/CD
+        - Testing
+        - Developer tooling
+        - Code cleanup
+        - Repository maintenance
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the maintenance work that needs to be completed.
+      placeholder: |
+        Update...
+        Remove...
+        Refactor...
+    validations:
+      required: true
+
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      description: Why should this work be done?
+      placeholder: |
+        This will reduce...
+        This is needed because...
+    validations:
+      required: true
+
+  - type: textarea
+    id: tasks
+    attributes:
+      label: Tasks
+      description: Break the work into smaller tasks when possible.
+      placeholder: |
+        - [ ] Update ...
+        - [ ] Remove ...
+        - [ ] Add tests ...
+        - [ ] Update documentation ...
+    validations:
+      required: false
+
+  - type: textarea
+    id: acceptance
+    attributes:
+      label: Completion criteria
+      description: What needs to be true before this chore can be closed?
+      placeholder: |
+        - CI passes
+        - Old implementation is removed
+        - Documentation is updated
+    validations:
+      required: false
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add links, implementation notes, or related issues.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature request
+description: Suggest a new feature or improvement.
+title: "feat: "
+labels:
+  - enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting an improvement.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What problem or limitation does this feature address?
+      placeholder: |
+        Currently, users cannot...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: Describe the behavior or feature you would like to see.
+      placeholder: |
+        Add support for...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Have you considered any alternative approaches or workarounds?
+    validations:
+      required: false
+
+  - type: textarea
+    id: acceptance
+    attributes:
+      label: Acceptance criteria
+      description: What should be true for this feature to be considered complete?
+      placeholder: |
+        - Users can ...
+        - The system should ...
+        - Tests cover ...
+    validations:
+      required: false
+
+  - type: dropdown
+    id: priority
+    attributes:
+      label: Suggested priority
+      description: How important is this feature?
+      options:
+        - Low
+        - Medium
+        - High
+    validations:
+      required: false
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Add mockups, examples, links, or other context.
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Before submitting
+      options:
+        - label: I searched existing issues and did not find an existing request for this feature.
+          required: true

.github/pull_request_template.yml

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+## Summary
+
+<!--
+Briefly explain what this PR changes and why.
+-->
+
+## Related issue
+
+<!--
+Link the issue this PR addresses.
+
+Examples:
+Closes #123
+Fixes #456
+Related to #789
+-->
+
+Closes #
+
+## Changes
+
+<!--
+List the main changes made in this PR.
+-->
+
+- 
+- 
+- 
+
+## Testing
+
+<!--
+Describe how you tested these changes.
+-->
+
+- [ ] Existing tests pass
+- [ ] New tests were added where appropriate
+- [ ] I manually tested the affected behavior
+
+### Test instructions
+
+<!--
+Provide steps reviewers can follow to test the change.
+-->
+
+1.
+2.
+3.
+
+## Screenshots
+
+<!--
+For UI changes, include before/after screenshots when useful.
+Delete this section if it does not apply.
+-->
+
+## Checklist
+
+- [ ] My changes are focused on the scope of this PR
+- [ ] I have reviewed my own changes
+- [ ] I have added or updated tests where appropriate
+- [ ] I have updated documentation where appropriate
+- [ ] There are no unnecessary debugging statements or commented-out code
+- [ ] CI checks pass