* Implement log retention policy
- Added Append method to io.Medium interface and implementations.
- Defined RotationOptions and updated log.Options to support log rotation.
- Implemented RotatingWriter in pkg/log/rotation.go with size and age-based retention.
- Updated Logger to use RotatingWriter when configured.
- Added comprehensive tests for log rotation and retention.
- Documented the log retention policy in docs/pkg/log.md and docs/configuration.md.
- Fixed MockMedium to return current time for Stat to avoid premature cleanup in tests.
* Fix formatting issues in pkg/io/local/client.go
The CI failed due to formatting issues. This commit fixes them and ensures all modified files are properly formatted.
* Fix auto-merge workflow CI failure
Inlined the auto-merge logic and added actions/checkout and --repo flag to gh command to provide the necessary git context. This resolves the 'fatal: not a git repository' error in CI.
* Address feedback on log retention policy
- Made cleanup synchronous in RotatingWriter for better reliability.
- Improved rotation error handling with recovery logic.
- Fixed size tracking to only increment on successful writes.
- Updated MockMedium to support and preserve ModTimes for age-based testing.
- Added TestRotatingWriter_AgeRetention and TestLogger_RotationIntegration.
- Implemented negative MaxAge to disable age-based retention.
- Updated documentation for clarity on Output priority and MaxAge behavior.
- Fixed typo in test comments.
- Fixed CI failure in auto-merge workflow.
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Co-authored-by: Claude <developers@lethean.io>
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