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>

The verifier proved the launcher path but never ran prepare-disk.ps1 itself,
so it now compares the injected n128c byte-for-byte with build/n128c.prg, and
the driver suite is part of the regression manifest.

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

Suites run from a manifest into fresh build directories with time limits,
captured logs, JSON results and SHA-256 comparisons; source, lexer and parser
artifacts are pinned, and self-tests cover timeout, failure signature and
changed-artifact detection.

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