The editor launcher now copies the Vim disk, injects vim128.prg into the copy,
and autostarts that disk copy in x128 80-column mode; host-loaded editor
sessions reported success without writing to the image.

E07-S03 adds a C128 tokenizer fixture and a two-session test that creates a
source in Vim, reopens it, and tokenizes the disk file without host conversion.

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E06-S06 routes deletion through a fat reference to obj_delete behind the heap's
always-on validation, so a stale value is refused with IF_ERR_FREED instead of
reading a freed destructor, and adds the objects.n8 parser fixture.

E07-S02 shares one launcher implementation that locks the writable image and
waits for the emulator exit and image flush, with x64sc for the editor and x128
for the compiler.

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