chore: add OSS readiness files and contributor docs

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug in ProjectX
+title: "[Bug] "
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: What went wrong?
+      description: A clear description of the bug.
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. Go to ...
+        2. Click on ...
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected vs actual behavior
+      description: What did you expect to happen, and what actually happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Your setup
+      placeholder: |
+        - ProjectX version/image tag: latest
+        - Deployment: Docker / manual
+        - OS: Ubuntu 22.04
+        - Browser: Firefox 124
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant logs (optional)
+      description: Run `docker logs <container-name>` and paste anything relevant here.
+      render: shell
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots (optional)
+      description: Drag and drop screenshots here if applicable.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Before submitting
+      options:
+        - label: I've searched existing issues and this hasn't been reported yet.
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or improvement for ProjectX
+title: "[Feature] "
+labels: ["feature"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: What's your idea?
+      description: A clear description of the feature you'd like to see.
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does it solve?
+      description: Help us understand the motivation behind this request.
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Anything else? (optional)
+      description: Mockups, examples from other apps, implementation ideas, alternatives you've considered.
+
+  - type: dropdown
+    id: contribution
+    attributes:
+      label: Want to help?
+      options:
+        - "Yes, I'd like to implement this"
+        - "I can help test and give feedback"
+        - "Just sharing the idea"
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Before submitting
+      options:
+        - label: I've searched existing issues and this hasn't been requested yet.
+          required: true