PHLEGM v8 SuperPET compile fix - checkpoint 29
Based on compiler log 2026-1007-2117-3924: all four Windows targets failed while compiling support-machine.bi.
Cause: support-machine.bi calls MachineCharacterBankOffset before machine-runtime.bi defines it.
Fix: add the matching forward declaration in PHLEGM.bas before module includes, for all backends.
The unexpected HEX/ELSEIF/LOOP diagnostics follow from the missing symbol and should be rechecked after rebuild.
Verification: declaration signature/order and archive integrity checked; native FreeBASIC build not performed here.
No changes to SuperPET firmware, runtime CPU instruction semantics, or character bank selection.
