Join bats: same glass-preference treatment as play_solo

join.bat + join_lan.bat + the btoperator.py generator template now prefer
build-glass\Release\btl4.exe when present and set BT_PLATFORM=glass with it
-- so MP sessions on a dev checkout get PadRIO (mouse-clickable cockpit
buttons: trigger config, MFD banks, radar rails) and the bindings.txt keymap,
identical to solo play.  Player zips (which ship only build\) fall back to
the pod build exactly as before.

Verified: 2-node loopback MP smoke on the GLASS build (the documented
procedure: A -egg MP.EGG -net 1501 + B -net 1601 + tools/btconsole.py) --
both nodes cross-connected (GameMachineHost 1502/1602), ~150 sim ticks
each, no errors.  btoperator.py syntax-checked; regenerated bats carry the
same guard.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

players/join.bat

@@ -2,14 +2,23 @@
 rem BT411 -- join 107.202.218.169's game (internet).  Seat/mech assigned
 rem by the operator.  Keep this file next to content\ + build\.
 cd /d %~dp0
-if not exist "build\Release\btl4.exe" goto badpath
+rem Prefer the GLASS build when present (dev checkout): PadRIO makes the
+rem cockpit surround's buttons mouse-clickable (trigger config etc.).  The
+rem pod build renders the same cockpit but clicks are a no-op there; player
+rem zips ship only build\.
+set GAME=build\Release\btl4.exe
+if exist "build-glass\Release\btl4.exe" (
+  set GAME=build-glass\Release\btl4.exe
+  set BT_PLATFORM=glass
+)
+if not exist "%GAME%" goto badpath
 if not exist "content\OPERATOR.EGG" goto badpath
 set BT_RELAY=107.202.218.169:1500
 set BT_LOG=join.log
 set BT_START_INSIDE=1
 set BT_DEV_GAUGES=1
 cd content
-..\build\Release\btl4.exe -egg OPERATOR.EGG -net 1501
+..\%GAME% -egg OPERATOR.EGG -net 1501
 echo.
 echo The game has exited.  If you did NOT quit on purpose
 echo (crash, or it never connected), send the operator the

players/join_lan.bat

@@ -5,14 +5,23 @@ rem unreliable on this network, so it is pinned).  If the operator's IP changes,
 rem update the address below (find it on the operator PC with `ipconfig`).
 rem Joining over the INTERNET?  Use join.bat instead.
 cd /d %~dp0
-if not exist "build\Release\btl4.exe" goto badpath
+rem Prefer the GLASS build when present (dev checkout): PadRIO makes the
+rem cockpit surround's buttons mouse-clickable (trigger config etc.).  The
+rem pod build renders the same cockpit but clicks are a no-op there; player
+rem zips ship only build\.
+set GAME=build\Release\btl4.exe
+if exist "build-glass\Release\btl4.exe" (
+  set GAME=build-glass\Release\btl4.exe
+  set BT_PLATFORM=glass
+)
+if not exist "%GAME%" goto badpath
 if not exist "content\OPERATOR.EGG" goto badpath
 set BT_RELAY=10.0.0.46:1500
 set BT_LOG=join.log
 set BT_START_INSIDE=1
 set BT_DEV_GAUGES=1
 cd content
-..\build\Release\btl4.exe -egg OPERATOR.EGG -net 1501
+..\%GAME% -egg OPERATOR.EGG -net 1501
 echo.
 echo The game has exited.  If you did NOT quit on purpose
 echo (crash, or it never connected), send the operator the

tools/btoperator.py

@@ -786,7 +786,15 @@ class Operator(QMainWindow):
         def guarded(header, sets, run, tail):
             return ("@echo off\n" + header +
                     "cd /d %~dp0\n"
-                    "if not exist \"build\\Release\\btl4.exe\" goto badpath\n"
+                    # Prefer the GLASS build when present (dev checkout): PadRIO
+                    # makes the cockpit buttons mouse-clickable; the pod build's
+                    # clicks are a no-op.  Player zips ship only build\\.
+                    "set GAME=build\\Release\\btl4.exe\n"
+                    "if exist \"build-glass\\Release\\btl4.exe\" (\n"
+                    "  set GAME=build-glass\\Release\\btl4.exe\n"
+                    "  set BT_PLATFORM=glass\n"
+                    ")\n"
+                    "if not exist \"%GAME%\" goto badpath\n"
                     "if not exist \"content\\" + egg_name +
                     "\" goto badpath\n" +
                     sets +
@@ -826,7 +834,7 @@ class Operator(QMainWindow):
                 "set BT_RELAY=%s:%d\nset BT_LOG=join.log\n"
                 "set BT_START_INSIDE=1\nset BT_DEV_GAUGES=1\n"
                 % (host, self.f_port.value()),
-                "..\\build\\Release\\btl4.exe -egg %s -net 1501\n" % egg_name,
+                "..\\%GAME% -egg %s -net 1501\n" % egg_name,
                 net_tail))
         lan_ip = _detect_lan_ip()
         lan_relay = ("%s:%d" % (lan_ip, self.f_port.value())) if lan_ip else "auto"
@@ -843,7 +851,7 @@ class Operator(QMainWindow):
                 "rem Joining over the INTERNET?  Use join.bat instead.\n",
                 "set BT_RELAY=%s\nset BT_LOG=join.log\n"
                 "set BT_START_INSIDE=1\nset BT_DEV_GAUGES=1\n" % lan_relay,
-                "..\\build\\Release\\btl4.exe -egg %s -net 1501\n" % egg_name,
+                "..\\%GAME% -egg %s -net 1501\n" % egg_name,
                 net_tail))
         with open(os.path.join(out_dir, "play_solo.bat"), "w",
                   newline="\r\n") as f:
@@ -854,7 +862,7 @@ class Operator(QMainWindow):
                 "(ARENA2/DBASE/FOGDAY/...).\n",
                 "set BT_START_INSIDE=1\nset BT_DEV_GAUGES=1\n"
                 "set BT_LOG=join.log\n",
-                "..\\build\\Release\\btl4.exe -egg ARENA1.EGG\n",
+                "..\\%GAME% -egg ARENA1.EGG\n",
                 "echo.\necho The game has exited.  If it closed unexpectedly,\n"
                 "echo send the operator content\\join.log.\npause\n"))
         self.log.appendPlainText(