sCode validation — 2026-09-10

Baseline: sCode_READY_STABLE_20260906
Refresh version: 2026.09.10

PASS: source-purity check (authoritative source remains .sC; no C/C++/Python/Julia source in sCode tree)
PASS: Linux x86-64 stage-0 smoke test
PASS: deterministic repeated math/finite/runtime probes
PASS: current Groovebox compatibility probe
      canonical engines = 5
      master slots = 128
      default native sample rate = 96000 Hz
      optional radio-quality rate = 128000 Hz
      EQR default = 0.4014 (intentional)
      Fractallizer default = 0.5995
      PKP envelope default = 0.5
PASS: Linux x86-64 distribution build
PASS: staged Linux install into an alternate prefix
PASS: installed sgroovebox launch from an unrelated working directory
PASS: native batch render generated MCC/WAV/PPM/MIDI/world/bundle outputs

Not runtime-tested here:
- macOS native stage-0 (seed not bundled)
- Windows native stage-0 (seed not bundled)
- Linux ARM64 native stage-0 (seed not bundled)

Cross-platform build/install scripts remain included and fail explicitly when a verified native seed is unavailable rather than pretending a build succeeded.
