feat: add GitHub issue and PR templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**wmk command / config**
+Add the `wmk` command or configuration you used here.
+
+**Logs**
+Add relevant logs or error output here.
+
+**Environment**
+ - OS: [e.g. Windows 11, Ubuntu 22.04]
+ - Python version: [e.g. 3.11]
+ - ModelKit version: [e.g. 0.1.0 or main]
+ - ONNX Runtime package and version: [e.g. onnxruntime 1.21.0]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.yaml

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+name: Feature Request
+description: File a feature or enhancement proposal
+title: "[FR]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for submitting a feature request.
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposal Summary
+      description: In a few sentences, provide a clear, high-level description of the feature request
+    validations:
+      required: true
+  - type: checkboxes
+    attributes:
+      label: What component(s) does this request affect?
+      description: Please choose one or more components below.
+      options:
+        - label: analyze (static analysis, pattern detection)
+        - label: optim (model optimization, graph rewriting)
+        - label: inspect (model inspection)
+        - label: compiler (model compilation)
+        - label: CLI (wmk commands)
+        - label: Other

.github/pull_request_template.md

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+## Describe your changes
+
+## Checklist before requesting a review
+- [ ] Add unit tests for this change.
+- [ ] Make sure all tests can pass.
+- [ ] Update documents if necessary.
+- [ ] Lint and apply fixes to your code by running `uv run ruff check --fix`
+- [ ] Is this a user-facing change? If yes, give a description of this change to be included in the release notes.
+
+## (Optional) Issue link