Convert issue templates to GitHub issue forms

Replace the old markdown bug report template with a structured YAML
form and add a feature request template. Add config.yml with a link
to search existing issues.

Author: bbatsov

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,73 @@
+name: Bug Report
+description: Report an issue with clojure-mode you've discovered.
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please make sure you're running the latest stable clojure-mode and that the problem hasn't been reported already.
+  - type: dropdown
+    id: mode
+    attributes:
+      label: Affected mode
+      options:
+        - clojure-mode
+        - clojurescript-mode
+        - clojurec-mode
+        - clojuredart-mode
+        - edn-mode
+        - jank-mode
+        - joker-mode
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual behavior
+      description: What happened instead?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Providing a reliable way to reproduce the problem will expedite its solution.
+    validations:
+      required: true
+  - type: checkboxes
+    id: emacs-q
+    attributes:
+      label: Reproducible with emacs -Q
+      description: Start Emacs with `emacs -Q`, install clojure-mode, and try to reproduce. This rules out interference from your personal config.
+      options:
+        - label: I've reproduced this with `emacs -Q`
+  - type: input
+    id: clojure-mode-version
+    attributes:
+      label: clojure-mode version
+      description: Run `M-x clojure-mode-display-version` to find this.
+      placeholder: "e.g. 5.22.0"
+    validations:
+      required: true
+  - type: input
+    id: emacs-version
+    attributes:
+      label: Emacs version
+      description: Use `C-h C-a` to find this.
+      placeholder: "e.g. 30.1"
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      placeholder: "e.g. macOS 15, Ubuntu 24.04, Windows 11"
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/bug_report.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Search existing issues
+    url: https://github.com/clojure-emacs/clojure-mode/issues?q=is%3Aissue
+    about: Please check if your issue has already been reported before opening a new one.

.github/ISSUE_TEMPLATE/config.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement for clojure-mode.
+labels: [enhancement]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What problem are you trying to solve? What's missing or frustrating?
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: How would you like this to work? Include examples if possible.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Any workarounds or alternative approaches you've tried or considered?