The audit trail
you already wanted.
Save points with labels
keeps every saved version of the project. Each is one change with a saying what it did. Together they're the project's history, and you can step back through it like a decision log that wrote itself.
Because a Power BI project saved as text files is just files, every visual, measure and setting shows up in that history. You can see exactly which lines a change touched.
Find the change that broke it
The Price tile shows an error. Last week it worked. Six commits have happened since.
Predict first: a tile broke sometime last week. What do you need to find the change?
Check: which commit broke the Price tile?
Marking what you sent
Work carries on after you send something. A pins a name to one commit, such as "submitted", so anyone can find exactly that version later. A attaches files to a tag, like the single .pbix you sent, frozen and never edited again.
Check: you sent a client version on Friday and kept working. How does someone find exactly what you sent?
The rule, in one breath
Commit small, label clearly, tag what you send. Then any question about what changed has an answer.
You don't have to type Git commands. The agent can commit for you. Your part is the message and the go-ahead: one change, one commit, a message that says why.
Next: platforms change, judgment travels.