lib/util.run: run_cmd (): renamed to run_args_cmd to clarify that this runs only the command line args command, not any command. added doc comment to clarify this.

lib/util.run: EXIT trap: use on_exit() function which calls run_cmd instead of having run_cmd be the handler, so that users can override this function to perform other commands (or no commands) after the script is read

lib/util.run: echo_func (): use the caller's FUNCNAME via the $FUNCNAME[] array instead of requiring them to pass it in the function args as `echo_func "$FUNCNAME" "$@"`

README.TXT: Maintenance: added steps to synchronize a Mac's settings with my testing machine's

README.TXT: Maintenance: to synchronize vegbiendev, jupiter, and your local machine: moved swap=1 right before src= dest=, which it applies to. aligned whitespace of the various commands.

README.TXT: Maintenance: steps to synchronize vegbiendev, jupiter, and your local machine: added steps to install dependencies

README.TXT: Maintenance: Added steps to synchronize vegbiendev, jupiter, and your local machine when changes are made on vegbiendev

README.TXT: converted spaces to tabs for easier readability in a whitespace-highlighting text editor, and so that pressing backspace deletes an indent rather than just a character (creating a misaligned indent)

Moved validation/ under planning/workflow/

Moved planning/use_cases/ under planning/goals/