Add shared report format flag

docs/consumers/guide.md

@@ -135,7 +135,8 @@ installation alongside aliases and integration commands.
 ## Invocation reporting
 
 `Invocation.Reporter()` supplies the reporter for the current handler. Use
-`Output()` or `RenderOutput()` for substantive results; use `Warn`, `Info`,
+`Report()` for formatted substantive values and optional text templates;
+use `Output()` or `RenderOutput()` for deliberate raw output. Use `Warn`, `Info`,
 `Progress`, and `Debug` for categorized messages. Queue a summary with
 `AtEnd().Info` when it belongs after the handler returns. The
 [CLI reference](../cli.md#reporting) owns flag grammar, visibility, prefixes,