Created docs/TESTS.md documenting all 25 tests across 5 test files:
- store_test.go: YAML serialization tests
- scheduler_test.go: Schedule parsing and invocation output tests
- runner_test.go: Command execution, exit codes, and Windows process tests
- autostart_windows_test.go: Windows startup folder shortcut creation tests
- autostart_linux_test.go: Linux XDG Desktop Entry autostart tests
Includes test descriptions, platform requirements, and usage instructions.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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