fix(term): pin ghostel to pre-regression 0.33.0 to stop the crash

ghostel 0.35.0-0.35.2 hard-crash the whole Emacs process when a terminal buffer is displayed. The native PTY path was reworked to spawn worker threads. On Linux/glibc a SIGSETXID handler then calls malloc while the main thread holds the arena lock, so opening an agent terminal takes the whole editor down (upstream #422, with #423 the macOS recursive-lock variant). Reproduced down to a plain M-x ghostel in a GUI frame, so it's not ai-term-specific.

Hold ghostel at the 0.33.0 build (ghostel-20260604.2049), which predates that rework. :ensure is satisfied by the installed 0.33.0 directory and won't upgrade it. The use-package block carries the rationale and a do-not-upgrade guard so it isn't bumped back into the crash before upstream ships a fix.

Also set ghostel-module-auto-install to download so the native module installs without the interactive prompt.

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