Calls now stage their arguments and push them in reverse so arg0 lands at
FP+2, each body gets a patched frame prologue when frames are requested, and
return leaves the frame with a byte or word result preserved. A new args
fixture proves the parameter and result path in x128.

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Co-Authored-By: Codebuff <noreply@codebuff.com>

Adds control flow, field access, forward self calls, method/program entry tracking, and E227 emission-failure reporting. Print vectors now live in safe zero-page cells to avoid the 6502 indirect-JMP page bug.