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tusb_sysview.{c,h} carry the SystemView glue: the TU_SV_* event/function-name
table (offset TU_SV_EVENT_BASE 512), module registration, the leveled
CFG_TUD_SYSVIEW/CFG_TUH_SYSVIEW gates (1 = ISR only, 2 = +stack call sites,
3 = +class drivers), per-task stack high-water reporting with a cached
snapshot refreshed once per rotation, and the dual-role guard that collapses
double-recording when device and host share one vector.
ISR exit emits RecordExitISRToScheduler() when SCB->ICSR.PENDSVSET is set at
exit (Cortex-M0/M3+), so FreeRTOS captures don't show a causeless task switch
after every USB ISR; RISC-V keeps the plain exit record.
Unit-tested under ceedling against a fake SEGGER_SYSVIEW.h vendor header.
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