Upmerge to SDK 1.6

.agents/skills.md

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+# Matter (CHIP) Agent Skills
+
+This directory contains skills and instructions for AI agents (Gemini, Co-pilot,
+etc.) to assist with development and code review in the Matter repository.
+
+## Available Skills
+
+### Python Test Reviewer
+
+-   **Location**: `.agents/skills/python-test-reviewer/`
+-   **Purpose**: Specialized guidance for reviewing Python tests.
+-   **Triggers**: Automatically activates when reviewing files ending in
+    `_test.py` or located in `src/python_testing`.
+
+### GitHub PR Description Writer
+
+-   **Location**: `.agents/skills/github-pr-description-writer/`
+-   **Purpose**: Guidelines for generating clear, concise, and objective GitHub
+    Pull Request descriptions.
+-   **Triggers**: Use when preparing or writing descriptions for pull requests.
+
+## Using Skills
+
+AI agents will automatically discover and load these skills when they are
+relevant to your task. You can also explicitly ask the agent to "Use the
+python-test-reviewer skill" if you want it to perform a focused review of your
+test code.
+
+---
+
+_Note: This structure is designed to support both Gemini and Co-pilot agents.
+Core guidelines are being migrated here from `.gemini/styleguide.md`._