Take WAE QTC traffic down

Ctrl+Z opens the QTC window for the station being worked, which is the key N1MM
puts it on, and the window is laid out the way N1MM lays it out: the header,
ten lines of time, callsign and serial number, an Agn and a Cfm button beside
each, Clear, Close and Cancel underneath, and the same colours — green for a
line that will be saved, red for one still empty, yellow for one that cannot be
read. Enter and Tab move forward and space moves within a line, so a line can be
walked while listening to it.

Sending, the lines are filled from the log and cannot be edited: the contacts
not reported to anybody yet, oldest first, never the station being worked, and
never past the ten any station may have. The rule for what has been reported is
N1MM's — a contact counts as reported when a QTC row carries its call and the
serial we sent it — so the pair is kept in the row the way N1MM keeps it.

Which way traffic goes is not the operator's choice on CW and SSB: Europe
receives and the rest of the world sends. On RTTY it goes both ways, and there
the window carries a switch. That is the one piece of the workflow that is ours
rather than N1MM's, which toggles a QTC mode outside the window instead.

Nothing here transmits. N1MM sends the lines on CW and RTTY and plays recorded
voice messages on SSB; we have no QTC message templates, no voice keyer and no
digital window, so Agn, Cfm and RX Ready move the cursor and the operator sends
by hand.

Running it caught what the tests could not: focus set in the constructor does
not stick, so the first thing typed into a freshly opened window was dropped and
every field after it took the value of the one before.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -279,8 +279,22 @@ number columns, and the series such as `9/10` goes in the misc text column. A
 log written by either program therefore opens in the other with its QTCs
 intact, and a QTC row is written to the Cabrillo file as a `QTC:` record.
 
-**Entering QTCs while operating is not there yet.** The rules, the scoring and
-the file formats are; the window for taking traffic down is next.
+**Ctrl+Z** opens the QTC window for the station being worked, which is the key
+N1MM uses. The window is laid out the same way: the header, ten lines of time,
+callsign and serial number, an Agn and a Cfm button beside each, and Clear,
+Close and Cancel underneath. Green is a line that will be saved, red one that is
+still empty, yellow one that cannot be read. Enter and Tab move forward, space
+moves within a line.
+
+Receiving, the lines are typed as they arrive. Sending, they are filled from the
+log — the contacts not reported to anybody yet, oldest first, never the station
+being worked, and never more than the ten any station may have — and cannot be
+edited. On CW and SSB the direction is fixed by the rules; on RTTY traffic goes
+both ways and the window has a switch.
+
+Nothing in the window transmits. On CW the operator sends from the entry window,
+on SSB by voice, and RTTY has no digital window yet, so Agn, Cfm and RX Ready
+move the cursor rather than putting anything on the air.
 
 The scoring was checked against six real WAE logs, and agrees with N1MM on
 points and on weighted multipliers to the contact.