RF_HandleEdgeInterrupt()'s software ping-pong toggle can leave P3IM0
parked in either edge direction while awake; Enter_Low_Power_Sleep()
never reset it, so sleep entry could randomly land on a direction that
misses the wake edge. Per the datasheet truth table (WO-04 2.9), only
edge modes support power-down wake, not level modes, so this forces a
known rising-edge state (matching RF_Init()'s own boot default) instead
of switching to level-triggered as originally requested. wo-05 updated
to record the deviation and rationale.
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