Add .ai_context directory for AI-assisted test generation

Author: huangmingxia

.ai_testgen/README.md

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+# AI-Assisted Test Generation
+
+This proposal aims to integrate an AI-assisted test generation system into the Hive upstream repository.  
+To achieve this, we suggest creating a dedicated directory `.ai_testgen` within the repository to store prompt files and related resources.  
+This ensures that contributors who already have the Hive repository can directly leverage these assets without the need to clone or maintain a separate repository.  
+
+## Two possible implementation options are described below:  
+
+**1. Clone external repository**  
+- Migrate the contents of `[email protected]:huangmingxia/test-generation-assistant.git` into the `.ai_testgen` folder.  
+    ```bash
+    git clone [email protected]:huangmingxia/test-generation-assistant.git
+    ```
+- Populate `.ai_testgen/config/rules` with upstream-specific rules to be used for generating test cases and end-to-end (e2e) tests.
+
+
+**2. Rules-only integration**  
+- Only add the `rules/` directory inside `.ai_testgen/rules`.  
+- Configure test case or e2e generation to load these rules by default.   
+**Limitation**:  
+  - For pre-merge testing, `jira-mcp-snowflake` currently lacks support for extracting associated PR links from Jira issues.    
+  - Additionally, DeepWiki is updated on a weekly basis, which means that code changes within this interval cannot be retrieved.    
+
+### Recommended approach [TBD]
+Currently recommend approach 1 (cloning the external repository), as it ensures all code changes, including pre-merge changes, are available during test generation.