Add repo-standardizer skill: polish any GitHub repo surface (#2715)

* Add repo-standardizer skill: polish any GitHub repo surface

* fix(skill): remove non-string metadata and fix template README refs for vally lint

* docs(skill): drop markdown relative links from README language-switcher example

Vally valid-refs flagged ./README.md and ./README.zh.md as missing file
references; they are generated artifacts, not skill files. Keep the
example as plain text to satisfy the linter.

* fix(template): add missing language switcher to English README template

Align with README.zh.md template and SKILL.md switcher convention:
current language as plain text, other languages as relative links.

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Co-authored-by: programmingWTF <programmingWTF@users.noreply.github.com>

skills/repo-standardizer/templates/issue-form-feature.yml

@@ -0,0 +1,43 @@
+name: Feature request
+description: Suggest an idea for this project
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a feature!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem statement
+      description: What problem does this feature solve? What is the pain point?
+      placeholder: It's annoying that...
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: Describe the behavior you would like to see.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Any workarounds or alternative approaches you've tried.
+    validations:
+      required: false
+  - type: dropdown
+    id: scope
+    attributes:
+      label: Scope
+      description: How big is this change?
+      options:
+        - Small (bugfix-like, < 100 lines)
+        - Medium (new module, ~100-500 lines)
+        - Large (architectural change)
+      default: 0
+    validations:
+      required: true