docs: sync feature request template (#49)

## Summary

- synchronize the Ruby feature-request form with the managed SDK
template
- keep the change separate from the review-gated community-files PR

## Impact

Issue reporters see the shared feature-request fields and wording. This
only changes GitHub issue-form metadata; it does not affect the Ruby
package API or runtime behavior.

## Validation

- `git diff --check`
- byte-for-byte comparison against
`skills/sdk-sync/templates/.github/ISSUE_TEMPLATE/feature_request.yml`

Author: albert20260301

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,23 +1,21 @@
 name: Feature Request
-description: Suggest an idea or improvement
+description: Suggest a feature
 labels: ["enhancement"]
 body:
   - type: textarea
     id: problem
     attributes:
       label: Problem
-      description: What problem would this solve?
+      description: What problem does this solve?
     validations:
       required: true
   - type: textarea
-    id: proposal
+    id: solution
     attributes:
       label: Proposed Solution
-      description: Describe the solution you'd like.
     validations:
       required: true
   - type: textarea
     id: alternatives
     attributes:
       label: Alternatives Considered
-      description: Describe any alternative solutions or workarounds.