Spiraldrive dreamcast (#481)

* new dreamcast dump fixes

* LF rule

* cleanup

* dreamcast command

* spiral::dreamcast command

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* LF line endings in working copy

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

more patched plextors

fix

the disc made me do it (#453)

* the disc made me do it

* spiral testing

* agents guidance

* spiraldrive progress

* spiral work

* rework

* dump loop cleanup

* 32-bit fix

* simplified seek

* dream fixes #1

* subq from drive

* multisession support

* agents cleanup

* update ponytail, add leadout sectors option for spiraldrive

* moved seek up

Prevent LBA overflow during % display (#472)

* Prevent LBA overflow during % display

* Simplify

* Match solution for CD

* Don't promote type in CD status update

Disable jamless play before dump (#469)

* Disable jamless play before dump

* Try catch around jamless play disabling

* revert try catch

READ CD: request the exact transfer length (#459)

Fix READ CDDA short transfer check rejecting oversized buffers (#468)

cmd_read_cdda() flagged HOST_SHORT_TRANSFER whenever the transferred length
differed from the expected D8 size. plextor_leadin_read() and the drive test
pass a CD_RAW_DATA_SIZE buffer for DATA_SUB, so where the host sees the full
requested length every read was treated as failed and the Plextor lead-in was
never identified.

Only treat a transfer as short when fewer bytes than expected were received.

Add LG GP57ES40 drive (#466)

Fix help (#465)