report the working directory to the terminal with OSC 7

Before each prompt gosh sends ESC ] 7 ; file://host/path BEL (host and
path percent-encoded), so terminals like GNOME Terminal open new tabs
and windows in the directory of the shell instead of the one gosh was
started in. Nothing is sent if stdout is not a terminal or TERM=dumb.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packaging/man/gosh.1

@@ -739,6 +739,13 @@ If the last command failed, its exit status is shown as
 .BI [ N ]
 before the
 .BR $ .
+.PP
+Before each prompt, gosh reports the working directory to the terminal with
+the OSC 7 escape sequence
+.RB ( "ESC ] 7 ; file://" \fIhost\fP/\fIpath\fP " BEL" ),
+so terminals like GNOME Terminal open new tabs and windows in the same
+directory. Nothing is sent if the output is not a terminal or
+.BR TERM=dumb .
 .SH ENVIRONMENT
 .TP
 .B GOSH_HISTFILE