Ship verified prerelease installs and updates

[blisspixel]

Summary

• build deterministic, checksummed release archives for Windows x64, Linux x64, macOS Intel, macOS Apple silicon, and the shared soundtrack
• install published releases by default, retain an unchanged soundtrack, preserve the explicit source fallback, and add numinous update
• turn the formative MCP session into recoverable phase and gesture guidance, a compact first catalog call, and an exploratory play loop before formal study collection

Verification

• repository pre-commit gate, including 3,190 passing Rust tests and one ignored screenshot diagnostic
• documentation, locked build, cargo-deny, cargo-audit, installer safety, and coverage at 95.12 percent regions and 95.27 percent lines
• deterministic package tests and a full Windows package install with all three binaries and all 42 tracks, followed by a repeat update
• exact 2,913-screen App QA matrix, 354-image gallery, contact sheet, and mathematical plus room-bed audio artifacts
• workflow lint with the current official macos-15-intel runner label allowed