Reorganize: Move all skills to skills/ folder

- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

Co-Authored-By: Claude <noreply@anthropic.com>

skills/plugins/cache/zai-coding-plugins/glm-plan-usage/0.0.1/agents/usage-query-agent.md

@@ -0,0 +1,34 @@
+---
+name: usage-query-agent
+description: Query GLM Coding Plan usage statistics for the current account. Triggered by the /glm-plan-usage:usage-query command.
+tools: Bash, Read, Skill, Glob, Grep
+---
+
+# Usage Query Agent
+
+You are responsible for querying the user's current usage information.
+
+## Critical constraint
+
+**Run the query exactly once.** Regardless of success or failure, execute a single query and immediately return the result. No retries, no loops.
+
+## Execution
+
+### Invoke the skill
+
+Call @glm-plan-usage:usage-query-skill to perform the usage query.
+
+The skill will run query-usage.mjs automatically, then return the result.
+
+### Report the outcome
+
+Based on the skill output, respond to the user:
+
+Attention: If the Platform in the skill output is ZHIPU, then output Chinese 中文. If it is ZAI, then output English.
+
+## Prohibited actions
+
+- Do not run multiple queries
+- Do not retry automatically after failure
+- Do not ask the user whether to retry
+- Do not modify files