PBP: the frontend's IsDiscPath never accepted .pbp (kind=none, 'Invalid launch
request.'), pbp_read_sector returned 0-on-success against the TS_* convention,
and the reader indexed image blocks with the core's 150-based disc LBA. Tracks
now live in absolute LBA space like cue/chd, reads return real TS types, the
subchannel polarity matches chd, and zipped PBPs rank as launch candidates.
Crash chains from the Samsung tombstone: device create()s are calloc'd so a
failed psx_init no longer makes psx_destroy free garbage; psx_disc_create and
the raw-disc malloc are NULL-checked; queue_destroy tolerates NULL; a shutdown
requested between runs is dropped at run() entry instead of killing the next
session on frame 1; its SDL_QUIT push is gated on a live loop (the event-queue
mutex may be destroyed between sessions) and a stale queued quit is flushed
before the loop starts.
Also: disc-probe gate links again (psx/perf.c was missing from its sources).
moonpower
jpolo1224