tooling: Add GitHub issue and PR templates.

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a bug in a driver or module.
+title: "<component>: <short description>"
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug! Please fill in the details below.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What happened? What did you expect instead?
+      placeholder: |
+        When I call `sensor.temperature()`, the returned value is always 0.0.
+        I expected a plausible room temperature (~20-30°C).
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Minimal code or steps to trigger the bug.
+      placeholder: |
+        ```python
+        from machine import I2C
+        from hts221 import HTS221
+        sensor = HTS221(I2C(1))
+        print(sensor.temperature())  # always 0.0
+        ```
+    validations:
+      required: true
+
+  - type: dropdown
+    id: component
+    attributes:
+      label: Driver / Component
+      description: Which driver or module is affected?
+      options:
+        - apds9960
+        - bme280
+        - bq27441
+        - daplink_flash
+        - gc9a01
+        - hts221
+        - im34dt05
+        - ism330dl
+        - lis2mdl
+        - mcp23009e
+        - ssd1327
+        - steami_config
+        - vl53l1x
+        - wsen-hids
+        - wsen-pads
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: MicroPython version, board revision, firmware version.
+      placeholder: |
+        - MicroPython: v1.24.1
+        - Board revision: 3
+        - DAPLink firmware: 0259
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / Output
+      description: Paste any relevant error messages or output.
+      render: text
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: STeaMi Website
+    url: https://www.steami.cc/
+    about: Visit the STeaMi website for general information.

.github/ISSUE_TEMPLATE/documentation.yml

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+name: Documentation
+description: Report missing or incorrect documentation.
+title: "docs: <short description>"
+labels: ["documentation"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Help us improve the documentation!
+
+  - type: textarea
+    id: what
+    attributes:
+      label: What needs documentation
+      description: What is missing, unclear, or incorrect?
+      placeholder: |
+        The APDS9960 README does not document the gesture recognition methods
+        (gesture(), set_gesture_gain(), etc.).
+    validations:
+      required: true
+
+  - type: dropdown
+    id: component
+    attributes:
+      label: Driver / Component
+      description: Which driver or module is concerned?
+      options:
+        - apds9960
+        - bme280
+        - bq27441
+        - daplink_flash
+        - gc9a01
+        - hts221
+        - im34dt05
+        - ism330dl
+        - lis2mdl
+        - mcp23009e
+        - ssd1327
+        - steami_config
+        - vl53l1x
+        - wsen-hids
+        - wsen-pads
+        - README / CONTRIBUTING
+        - Wiki (wiki.steami.cc)
+    validations:
+      required: true
+
+  - type: textarea
+    id: current
+    attributes:
+      label: Current state
+      description: What documentation exists now?
+      placeholder: The README only has a basic "Installation" section.
+    validations:
+      required: false
+
+  - type: textarea
+    id: desired
+    attributes:
+      label: Desired state
+      description: What should be added or changed?
+      placeholder: |
+        Add a "Gesture Recognition" section with:
+        - Method signatures and return values
+        - Example code
+        - Supported gestures list
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or improvement.
+title: "<component>: <short description>"
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Describe the feature you'd like and why it would be useful.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What do you want and why?
+      placeholder: |
+        I would like a `heading()` method on LIS2MDL that returns the compass
+        bearing in degrees (0-360), so I can build a digital compass without
+        computing atan2 manually.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: component
+    attributes:
+      label: Driver / Component
+      description: Which driver or module is concerned?
+      options:
+        - apds9960
+        - bme280
+        - bq27441
+        - daplink_flash
+        - gc9a01
+        - hts221
+        - im34dt05
+        - ism330dl
+        - lis2mdl
+        - mcp23009e
+        - ssd1327
+        - steami_config
+        - vl53l1x
+        - wsen-hids
+        - wsen-pads
+        - New driver
+        - Project-wide
+    validations:
+      required: true
+
+  - type: textarea
+    id: api
+    attributes:
+      label: Proposed API
+      description: Show how you would like to use this feature.
+      render: python
+      placeholder: |
+        mag = LIS2MDL(I2C(1))
+        print("Heading:", mag.heading(), "°")
+    validations:
+      required: false
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Any workarounds or other approaches you've thought of?
+    validations:
+      required: false

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+<!-- What does this PR do? Reference the issue: Closes #XXX -->
+
+## Changes
+
+<!-- List the main changes -->
+
+-
+
+## Checklist
+
+- [ ] `ruff check` passes
+- [ ] `python -m pytest tests/ -k mock -v` passes (no mock test broken)
+- [ ] Tested on hardware (if applicable)
+- [ ] README updated (if adding/changing public API)
+- [ ] Examples added/updated (if applicable)
+- [ ] Commit messages follow `<scope>: <Description.>` format