fix(kenwood): KY takes a FIXED 24 characters, not a string

CW over CAT never worked on a Kenwood. The KY implementation was written against
Elecraft's, which accepts a string of any length, so "KY OH5CX;" went out and a
TS-590SG answered "?;". OpsLog read that as "this radio refuses CW over CAT" and
told the operator to fit a serial keyer — advice that was wrong, and expensive.

The TS-590 manual is explicit: P2 has a fixed length of 24, blanks are filled
with spaces, and those spaces are not keyed. So the fix costs nothing on air; it
is simply the shape the command has. Elecraft stays variable-length, where
padding would key the trailing spaces as word gaps.

The semicolon is also gone from the allowed CW characters. It TERMINATES a CAT
frame, the manual forbids it in P2, and one in a macro would have closed the
command early and left the rest of the message to be read as commands.

Found from a log and a manual page, not from a rig: nobody here owns a Kenwood.
What is proven is the frame shape; that a TS-590SG then keys it still needs the
operator to confirm.

changelog.json

@@ -3,10 +3,12 @@
     "version": "0.24.5",
     "date": "",
     "en": [
-      "Digital decodes: a station's grid square could be logged as its callsign. An unrecognised word after CQ made the parser skip a slot, and a four-character grid passes every shape test a callsign does, so \"CQ FOO JN36\" was read as a contact with JN36 — spotted, coloured and counted like any other station. A grid in the callsign position is now refused."
+      "Digital decodes: a station's grid square could be logged as its callsign. An unrecognised word after CQ made the parser skip a slot, and a four-character grid passes every shape test a callsign does, so \"CQ FOO JN36\" was read as a contact with JN36 — spotted, coloured and counted like any other station. A grid in the callsign position is now refused.",
+      "CW over CAT now works on a Kenwood. The KY command was written against Elecraft's, which takes a string of any length; a Kenwood requires exactly 24 characters, so every message was refused and OpsLog reported that the radio would not do CW over CAT at all — sending operators to buy a serial keyer they did not need. A semicolon is also stripped from CW text now: it ends a CAT frame, so one in a macro cut the command short."
     ],
     "fr": [
-      "Décodes digitaux : le carré locator d une station pouvait être enregistré comme son indicatif. Un mot non reconnu après CQ faisait sauter un cran au parseur, et un grid de quatre caractères passe tous les tests de forme d un indicatif — « CQ FOO JN36 » était donc lu comme un contact avec JN36, spotté, coloré et compté comme n importe quelle autre station. Un grid à la place de l indicatif est maintenant refusé."
+      "Décodes digitaux : le carré locator d une station pouvait être enregistré comme son indicatif. Un mot non reconnu après CQ faisait sauter un cran au parseur, et un grid de quatre caractères passe tous les tests de forme d un indicatif — « CQ FOO JN36 » était donc lu comme un contact avec JN36, spotté, coloré et compté comme n importe quelle autre station. Un grid à la place de l indicatif est maintenant refusé.",
+      "Le CW par CAT fonctionne enfin sur un Kenwood. La commande KY avait été écrite d après celle d Elecraft, qui accepte une chaîne de longueur libre ; un Kenwood en exige exactement 24 caractères, donc chaque message était refusé et OpsLog annonçait que la radio ne savait pas faire de CW par CAT — envoyant des opérateurs acheter un keyer série dont ils n avaient pas besoin. Le point-virgule est aussi retiré du texte CW : il termine une trame CAT, donc un seul dans une macro coupait la commande."
     ]
   },
   {