chore: add pr and issue templates

Author: ilyar

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a reproducible bug or unexpected behavior
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the bug, including expected and actual behavior
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Provide a list of steps to reproduce the bug
+      placeholder: |
+        1. Run `yarn dev`
+        2. Enter `...`
+        3. See error
+    validations:
+      required: true
+
+  - type: input
+    id: environment
+    attributes:
+      label: Environment
+      description: Provide relevant environment details (OS, runtime, etc).
+      placeholder: "`node -v && uname -a` e.g., Ubuntu 25.04, Node 22.16.0"
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs or Screenshots
+      description: Include relevant logs, stack traces, or screenshots
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/docs_update.yml

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+name: Docs Update
+description: Suggest an update or improvement to the documentation
+labels: ["documentation"]
+body:
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Suggested Update
+      description: Describe the proposed documentation update or fix
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Add any other relevant information or context
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea or enhancement
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: summary
+    attributes:
+      label: Feature Summary
+      description: Clearly describe the feature you’d like to see added
+    validations:
+      required: true
+
+  - type: textarea
+    id: usecase
+    attributes:
+      label: Use Case
+      description: Explain why this feature is useful or what problem it solves
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Have you considered other solutions or workarounds?
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context or screenshots here
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/generic.yml

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+name: Generic Issue
+description: Open a general issue or question
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Provide a detailed description of the issue or question
+    validations:
+      required: true

.github/pull_request_template.md

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+## Issue
+
+Closes #<issue-number>
+
+## Checklist
+
+Please ensure the following items are completed before requesting review:
+
+* [ ] Updated `CHANGELOG.md` with relevant changes
+* [ ] Documented the contribution in `README.md`
+* [ ] Added tests to demonstrate correct behavior (both positive and negative cases)
+* [ ] All tests pass successfully (`npm test`)
+* [ ] Code passes linting checks (`npm run lint`)