Master bus on the live mix: glue + makeup + limiter (fix "muted")

Paul: "everything sounds very muted … I don't hear a lot of the master chain." Diagnosis (signal-chain audit): on desktop the LIVE ring path summed into a UNITY masterGain with no glue and no makeup.

• This adds a causal master bus on the live SUM: a gentle glue compressor (−22 dB, 2.2:1) → a makeup lift (~+8 dB) → a brickwall limiter (−1.5 dB, 20:1) for peak safety.

LIVE-ONLY — the baked export path keeps its own mastering, so segment-parity and the fixtures byte-identity are untouched.

▶ Play it: Food Court Eternity — the brightest, most processed corner of the space https://stellate.app/?genre=vaporwave&seed=5896&path=1679.4393,1698.4426,1660.4426&xdur=13.122

c42f3ff https://github.com/aboard-io/stellate/commit/c42f3ff00f1b5dda2864e44c5307f224214a7d16