Capture several frames per channel and reject a repeated frame number

[mikelangmayr]

• --repeat takes several frames per channel, so one channel can be sampled repeatedly rather than only swept
• expose() returns success even when the readout timed out, so a repeated frame number is the only available sign the buffer never moved; a repeat is now reported as a failure instead of handing back the same data twice
• The RAW glob missed the collision-suffixed names the writer produces for a repeated frame, so new files went unnoticed; widening it alone would have turned the duplicates into false successes
• --keep-config reads the ACF host-side only and --mode names the mode, for a controller whose configuration should be left alone
• Verified on the emulator, where frames advance and it reports every frame captured, and against an Archon, where it correctly reports the repeats and names the reason