chore(skills): sync .gemini and .github skills and fix i18n validator

.github/skills/gh-issue-replier/SKILL.md

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+---
+name: gh-issue-replier
+description: Professional English replier for GitHub issues. Use when a task is completed, a bug is fixed, or more info is needed from the user. Automates replying using the 'gh' CLI tool.
+---
+
+# Gh Issue Replier
+
+## Overview
+
+The `gh-issue-replier` skill enables Gemini CLI to interact with GitHub issues professionally. It enforces English for all communications and leverages the `gh` CLI to post comments.
+
+## Workflow
+
+1.  **Identify the Issue**: Find the issue number (e.g., #49).
+2.  **Check Star Status**: Run the bundled script to check if the author has starred the repo.
+    *   Command: `bash scripts/check_star.sh <issue-number>`
+    *   Interpretation: 
+        *   Exit code **0**: User has starred. Use "Already Starred" templates.
+        *   Exit code **1**: User has NOT starred. Include "Star Request" in the reply.
+3.  **Select a Template**: Load [templates.md](references/templates.md) to choose a suitable English response pattern.
+4.  **Draft the Reply**: Compose a concise message based on the star status.
+5.  **Post the Comment**: Use the `gh` tool to submit the reply.
+
+## Tool Integration
+
+### Check Star Status
+```bash
+bash scripts/check_star.sh <issue-number>
+```
+
+### Post Comment
+```bash
+gh issue comment <issue-number> --body "<message-body>"
+```
+
+Example (if user has NOT starred):
+```bash
+gh issue comment 49 --body "This has been fixed in v1.2.7. If you find this helpful, a star on the repo would be much appreciated! ⭐"
+```
+
+Example (if user HAS starred):
+```bash
+gh issue comment 49 --body "This has been fixed in v1.2.7. Thanks for your support!"
+```
+
+## Guidelines
+
+-   **Language**: ALWAYS use English for the comment body, even if the system prompt or user conversation is in another language.
+-   **Tone**: Professional, helpful, and appreciative.
+-   **Precision**: When announcing a fix, mention the specific version or the logic change (e.g., "Updated regex pattern").
+-   **Closing**: If the issue is resolved and you have permission, you can also use `gh issue close <number>`.