refactor: Return logs folder

logs/README.md

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+# Logs Directory
+
+This directory contains the application logs for Cognee.
+
+## Log Files
+
+- Log files are named by date in the format `YYYY-MM-DD_HH-MM-SS.log`
+- Logs are stored in plain text format with a consistent structure
+- Each log entry includes:
+  - Timestamp (ISO format)
+  - Log level (padded to consistent width)
+  - Message
+  - Additional context (if any)
+  - Logger name (in square brackets)
+- Exception tracebacks are included for error logs
+
+## Sample Log Entry
+
+```
+2025-03-27T13:05:27.481446Z [INFO    ] Structured log message user_id=user123 action=login status=success [TestLogger]
+```
+
+## Retention Policy
+
+The system automatically keeps only the 10 most recent log files. Older log files are automatically deleted when new log files are created. This prevents excessive disk usage in long-running deployments.
+
+## Usage
+
+Logs are automatically generated by the application's logging mechanism. No manual actions are required to use this feature.
+
+The logs directory structure is preserved in version control, but the log files themselves are gitignored.