MAINT streamline repository guidance and contribution workflow

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a reproducible problem in mne-denoise.
+title: ""
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Usage and support questions belong on the [MNE Forum](https://mne.discourse.group/).
+        Use this form for suspected bugs in mne-denoise.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the incorrect behavior and when it occurs.
+      placeholder: Tell us what went wrong.
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproducible-example
+    attributes:
+      label: Minimal reproducible example
+      description: Provide the smallest runnable example that reproduces the problem. Use the public API.
+      render: python
+    validations:
+      required: true
+
+  - type: textarea
+    id: data-context
+    attributes:
+      label: Data and context (optional)
+      description: Include data characteristics or a small sample only when they are needed to reproduce the problem.
+
+  - type: textarea
+    id: expected-result
+    attributes:
+      label: Expected result
+      description: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual-result
+    attributes:
+      label: Actual result
+      description: What happened? Include the complete traceback or relevant output when available.
+      render: text
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Include the versions and operating system used for the reproducer.
+      placeholder: |
+        Python:
+        mne-denoise:
+        MNE-Python (if relevant):
+        Operating system:
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: MNE Forum
+    url: https://mne.discourse.group/
+    about: Ask usage and support questions in the MNE community forum.

.github/ISSUE_TEMPLATE/documentation.yml

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+name: Documentation issue
+description: Report unclear, missing, incorrect, or stale documentation.
+title: ""
+body:
+  - type: input
+    id: location
+    attributes:
+      label: Documentation location
+      description: Give the page, docstring, example, or API entry where the problem appears.
+      placeholder: Paste a URL or file and section name.
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What is incorrect, unclear, missing, or stale?
+      placeholder: Describe the documentation problem.
+    validations:
+      required: true
+
+  - type: textarea
+    id: suggested-improvement
+    attributes:
+      label: Suggested improvement (optional)
+      description: If you have an idea for a correction, share it here.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a capability or scientific enhancement for mne-denoise.
+title: ""
+labels:
+  - enhancement
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or scientific use case
+      description: What are you trying to accomplish, and what is currently missing?
+      placeholder: Describe the user or scientific need.
+    validations:
+      required: true
+
+  - type: textarea
+    id: desired-behavior
+    attributes:
+      label: Desired behavior
+      description: What capability or change would help?
+      placeholder: Describe the outcome you would like.
+    validations:
+      required: true
+
+  - type: input
+    id: scientific-reference
+    attributes:
+      label: Scientific reference (optional)
+      description: Add a paper, DOI, or other reference when the request concerns a published method.
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives and additional context (optional)
+      description: Share workarounds, alternatives, examples, or other context. Implementation details are not required.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,32 +1,16 @@
-# Pull Request
+<!--
+Please read CONTRIBUTING.md before opening a pull request.
 
-## Description
+Keep this pull request focused and link the relevant issue when one exists.
+Explain the motivation and the behavior implemented or fixed. For scientific
+changes, identify the primary reference and explain intentional deviations or
+extensions. Add or update tests, documentation, and a changelog fragment when
+applicable. Disclose AI assistance according to CONTRIBUTING.md, including the
+tool, manner, and scope of assistance.
+-->
 
-<!-- Provide a general summary of your changes in the Title above -->
-<!-- Please describe your changes in detail -->
+#### Reference issue (if any)
 
-## Related Issue
+#### What does this implement/fix?
 
-<!-- This project only accepts pull requests related to open issues -->
-<!-- If suggesting a new feature or change, please discuss it in an issue first -->
-<!-- If fixing a bug, there should be an issue describing it with steps to reproduce -->
-<!-- Please link to the issue here: -->
-
-## Type of Change
-
-<!-- Please delete options that are not relevant -->
-
-- [ ] Bug fix (non-breaking change which fixes an issue)
-- [ ] New feature (non-breaking change which adds functionality)
-- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
-- [ ] Documentation update
-
-## Checklist
-
-<!-- Please check each item below -->
-
-- [ ] My code follows the code style of this project (`spin lint`)
-- [ ] I have added tests that prove my fix is effective or that my feature works
-- [ ] I have run the full test suite and all tests pass
-- [ ] I have updated the documentation accordingly (`spin docs` builds without warnings)
-- [ ] I have added a numbered Towncrier fragment in `docs/changes/devel/` (if applicable)
+#### Additional information