BlackZone Flip→Base + LS/SS Scaling (v6, no-global-in-func fix)

Flip to trend +1 → immediately open LONG_BASE.

While trend is at +1, add when LS1 → LS2 → LS3 are triggered (one at a time).

Flip to trend -1 → immediately open SHORT_BASE; add with SS1 → SS2 → SS3.