refactor(winkeyer): learn the slow boot instead of naming the keyer

The K3NG entry added an hour ago is gone. It named one clone among many —
WKmini, home-built Arduinos, unbranded boxes — for hardware that speaks
exactly the same protocol, and it was the only line in the engine list that
picked a boot delay rather than a protocol. An operator with an unlabelled
clone would have had to guess.

The delay is now learnt per port. The first connect finds out by failing the
quick attempt and succeeding on the slow one; that fact is written to a
global setting keyed by the port, and every connect afterwards goes straight
to the slow attempt. Global rather than per profile on purpose: which keyer
is plugged into COM3 belongs to the computer, and switching profiles for a
different rig does not change the keyer on the desk.

Two tests hold the contract from both sides — a slow keyer must be reported
as slow, and a keyer that answers at once must not be, or every K1EL connect
would inherit seconds it never needed.

changelog.json

@@ -9,7 +9,7 @@
       "Appearance: new Sahara theme, warm sand tones for long sessions in daylight.",
       "US counties: Connecticut returned the census planning regions, and San Francisco, Doña Ana, Baltimore city and several Alaska boroughs matched nothing at all. The cluster now shows the same county as the Info panel. Re-download the county database.",
       "QSL: the manager (QSL_VIA) and the sending method (QSL_SENT_VIA / QSL_RCVD_VIA) are separate fields at last, as ADIF defines them. Imports keep both, exports write both, and a log where they were mixed is offered a correction at startup.",
-      "WinKeyer: the opening handshake follows K1EL’s own sequence (RTS off, parser resync, echo test), which wakes keyers that stayed silent, and a port where nothing answers now says so instead of showing “connected”. K3NG keyers have their own entry in the list — they reboot when the port opens and need longer to answer."
+      "WinKeyer: the opening handshake follows K1EL’s own sequence (RTS off, parser resync, echo test), which wakes keyers that stayed silent, and a port where nothing answers now says so instead of showing “connected”. A keyer that reboots when the port opens — K3NG and other Arduino builds — is waited out and remembered, so it opens directly next time."
     ],
     "fr": [
       "Amplificateurs : cochez ceux qui partagent un combineur et ON, OFF et OPERATE agissent sur tous à la fois. Chacun garde ses propres mesures.",
@@ -18,7 +18,7 @@
       "Apparence : nouveau thème Sahara, tons sable chauds pour les longues sessions en plein jour.",
       "Comtés US : le Connecticut renvoyait les planning regions du recensement, et San Francisco, Doña Ana, Baltimore city et plusieurs districts d’Alaska ne correspondaient à rien. Le cluster affiche maintenant le même comté que le panneau Info. Rechargez la base des comtés.",
       "QSL : le manager (QSL_VIA) et le mode d’envoi (QSL_SENT_VIA / QSL_RCVD_VIA) sont enfin deux champs distincts, comme le veut l’ADIF. Les imports gardent les deux, les exports les écrivent, et un log où ils étaient mélangés se voit proposer une correction au démarrage.",
-      "WinKeyer : la séquence d’ouverture suit celle de K1EL (RTS bas, resynchronisation, test d’écho), ce qui réveille les manipulateurs muets, et un port où rien ne répond le dit au lieu d’afficher « connecté ». Les K3NG ont leur propre entrée dans la liste : ils redémarrent à l’ouverture du port et mettent plus longtemps à répondre."
+      "WinKeyer : la séquence d’ouverture suit celle de K1EL (RTS bas, resynchronisation, test d’écho), ce qui réveille les manipulateurs muets, et un port où rien ne répond le dit au lieu d’afficher « connecté ». Un manipulateur qui redémarre à l’ouverture du port — K3NG et autres montages Arduino — est attendu puis mémorisé, pour s’ouvrir directement ensuite."
     ]
   },
   {