Bind the EE scheduler executor thread on first IRQ dispatch - #235
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The EE scheduler requires every scheduler operation to run on the executor thread, which gets bound in reset() or bindMainContextForSyscall(). The SIF DMA path (sceSifSetDma -> dispatchDmacHandlersForCause -> dispatchIrq) never binds it, so any direct call from outside the scheduler run loop trips the executor assertion in Debug builds.
Production is unaffected because guest code always runs inside the scheduler loop, and Release builds compile the assertion out, which is why CI never caught it.
dispatchIrq now binds the executor thread on first use, mirroring the lazy binding already done in bindMainContextForSyscall(). The assertion stays in place for every subsequent call.
Verified with the Debug test suite: previously crashed in PS2SifDma after 283 tests, now all 425 tests pass.