docs(agent): add rules and skills

.agent/skills/git-sync/SKILL.md

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+# Git Sync Skill
+
+## Description
+This skill allows the agent to check the remote Git repository for updates. It automatically pulls changes if a new version is available on the remote server.
+
+## Triggers
+Activate this skill when the user asks:
+- "Проверь обновления" (Check for updates)
+- "Загрузи новую версию" (Download new version)
+- "Синхронизируй с гитом" (Sync with git)
+- "Есть ли изменения?" (Are there changes?)
+
+## Execution
+To run this skill, execute the bash script:
+
+```bash
+/bin/bash .agent/skills/git-sync/scripts/check_and_pull.sh
+```
+
+## Response Guidelines
+1. **Success**: If the script says "Successfully updated", inform the user the project is now on the latest version.
+2. **No Updates**: If the script says "Up-to-date", tell the user no changes were found.
+3. **Error**: If the script fails or reports conflicts, ask the user to check git status manually.