chore: add issue and pull request templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report unexpected ACF Builder behavior
+title: "[Bug]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug. Please provide a small, complete example that reproduces the behavior.
+
+        For support or usage questions, please use the project's GitHub Discussions instead.
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: Describe the result you expected from ACF Builder.
+    validations:
+      required: true
+  - type: textarea
+    id: actual-behavior
+    attributes:
+      label: Actual behavior
+      description: Describe what happened instead. Include the error message or stack trace when available.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to reproduce
+      description: Include a minimal configuration snippet and the steps needed to observe the issue.
+      value: |
+        1.
+        2.
+        3.
+    validations:
+      required: true
+  - type: input
+    id: acf-builder-version
+    attributes:
+      label: ACF Builder version
+      placeholder: "Example: 1.12.0"
+    validations:
+      required: true
+  - type: input
+    id: acf-version
+    attributes:
+      label: Advanced Custom Fields version
+      placeholder: "Example: ACF Pro 6.2.0"
+    validations:
+      required: false
+  - type: input
+    id: wordpress-version
+    attributes:
+      label: WordPress version
+      placeholder: "Example: 6.5"
+    validations:
+      required: false
+  - type: input
+    id: php-version
+    attributes:
+      label: PHP version
+      placeholder: "Example: 8.2"
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any other details that may help diagnose the issue.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for ACF Builder
+---
+
+## Problem
+
+<!-- What limitation or workflow would this feature address? -->
+
+## Proposed solution
+
+<!-- Describe the API or behavior you would like to see. Include example builder code when helpful. -->
+
+## Alternatives considered
+
+<!-- Describe any workarounds or alternative approaches you have considered. -->
+
+## Additional context
+
+<!-- Add any other context, examples, or screenshots here. -->

.github/PULL_REQUEST_TEMPLATE.md

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+## Issue
+
+<!-- Describe the problem this change solves. Link related issues with #123. -->
+
+## Solution
+
+<!-- Describe the implementation and any changes to ACF Builder's public API. -->
+
+## Impact
+
+<!-- Note backwards-compatibility, generated ACF configuration, or performance implications. -->
+
+## Usage changes
+
+<!-- Document changes that users need to make, including migration steps where applicable. -->
+
+## Testing
+
+<!-- List tests added or updated. Include the command run and any manual ACF/WordPress verification. -->