Merge pull request #67 from ringof/claude/fix-fx3stop-issue-c4Gge

plan: add soak failure analysis (Pop A 0x1005, Pop B 0x1006) and issue script

soak: reset device to bootloader before firmware upload

diag: add GETSTATS instrumentation to startadc_mid_stream, soak -q mode

fix: use primed async start in dma_count_monotonic soak test

fix: move clear_halt to retry-only path in primed_start_and_read

docs: add plan for fixing FX3 stop/start cycle issue

fix: use primed async bulk read to eliminate PIB overflow race in tests

fix: add FlushEp after stall-clear in CLEAR_FEATURE handler

fix: replace CyU3PUsbStall with CyU3PUsbAckSetup in CLEAR_FEATURE handler

fix: check last line of fx3_cmd output for PASS/FAIL verdict

fix: remove destructive DMA teardown from CLEAR_FEATURE handler

test: disable libusb_clear_halt to isolate FX3 stop failures

fix: remove UsbResetEp from STARTFX3 — desyncs endpoint, kills streaming

instrument: add soak test diagnostics for test 30/32 failure analysis