User turns:
user: Arrange a complete listing of all files and directories presently located here, making sure you don't overlook the hidden ones too.
user: Transfer the 'annual_report.txt' in Documents directory to another directory that's in Documents directory, but also make sure it remains available in its current spot.
user: The directory is named 'Reports' .
user: Reveal the last lines of 'Q4_summary.doc' so we can ascertain how the report wraps up.
user: Attempt to relay a message to the individual with ID 'USR002' by logging in as USR001, updating them on the finalization of the report saying 'The report has been finalized.'.

Involved APIs: MessageAPI
GorillaFileSystem
Ground-truth function call path:
GorillaFileSystem.ls
GorillaFileSystem.find
GorillaFileSystem.cp
GorillaFileSystem.mv
GorillaFileSystem.grep
GorillaFileSystem.tail
MessageAPI.send_message