Document TI-99/4A controller limits and keyboard shortcuts in README

Joystick buttons beyond the first only reach digit keys 1-9 in
ti99sim-sdl's own source (src/sdl/ti994a-sdl.cpp) - there's no path to
0, Enter, Q, or Esc from a gamepad. Documents the real Esc-to-exit
behavior and full FCTN key row (Alt+1 through Alt+9, Alt+=), both
confirmed against the emulator's own bundled doc/README.html.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VLX1yYKJExGSXmgUhxKQG6

services/wolf.sh

@@ -3824,6 +3824,19 @@ when the TI-99/4A prompt ran, the installer offered to copy it there for
 you (tab-completing path prompt); otherwise copy it there by hand. Then
 just drop \`.ctg\`/\`.rpk\`/\`.bin\` cartridge files into \`roms/ti994a/\`.
 
+**Controls.** \`ti99sim-sdl\` maps a real gamepad's stick to the TI-99
+joystick directly, and any joystick button beyond the first (the fire
+button) to the number keys 1-9 (confirmed against its own source —
+\`( VIRTUAL_KEY_E ) ( VK_0 + std::clamp(( int ) event.jbutton.button, 1, 9 ))\`
+in \`src/sdl/ti994a-sdl.cpp\`) — there's no source-level path from a
+joystick button to 0, Enter, Q, or Esc, so those need a real keyboard
+reaching the stream. **Esc exits the emulator** (confirmed against its
+own bundled \`doc/README.html\`) and hands focus back to ES-DE once the
+process closes. The TI-99/4A's own FCTN function-key row, for anything
+needing keys beyond what a joystick provides, is (also confirmed
+against that same doc): Alt+1 DEL, Alt+2 INS, Alt+3 ERASE, Alt+4 CLEAR,
+Alt+5 BEGIN, Alt+6 PROC'D, Alt+7 AID, Alt+8 REDO, Alt+9 BACK, Alt+= QUIT.
+
 ## MAME: sample packs showing up as games
 MAME sample packs (audio for a handful of older analog-sound games) use the
 exact same \`.zip\`-per-game naming as real ROMs, so if they're sitting in