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ONE STATE · TWO MODEL BOUNDARIES · ONE E47 WITNESS

This is the Python/CI companion to SKYRMION Runtime 2. The browser remains the interactive 120 Hz 6DOF engine. Python supplies the typed vehicle boundary, canonical E47 witness, and deterministic receipts without creating a second flight-physics authority.

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Canonical source

• src/aetheris/flight_runtime.py
• Tests
• Technical note
• SKYRMION Runtime 2

Runtime split

State6DOF
   ↓
VehicleRegistry
   ├─ CONVENTIONAL
   │  F-16 · SR-71 · X-15
   │  browser aerodynamic 6DOF
   │
   └─ EXPLICIT_EXPERIMENTAL_SIMULATION
      EIDOLON · MANTA · SKYRMION · SYNTAX JACOB
             ↓
        shared E47Witness
             ↓
        experimental adapter
             ↓
         E2 trajectory

The switch changes the vehicle model, not the state universe.

E47 witness

The Python witness compiles the existing repository authority once from the canonical E47 operators and projector.

For a state psi:

• P47 @ psi remains a 125-component carrier vector in a rank-47 subspace.
• the orthonormal kernel basis supplies actual 47 coordinates a47 = Q† psi.
• KP47 = 0, K²P47 = 0, projector idempotence, rank 47, and spectral gap 11664 are machine checks.
• state capture is ||P47 psi||² / ||psi||²; it is not generally equal to 47/125.
• 47/125 remains the object-level rank fraction rank(P47)/125.

Semigroup correction

The canonical continuous filter is S(t)=exp(-t K²) acting on the unprojected state. Once a state is projected, K²P47 psi = 0, so -K²(P47 psi) is an invariant diagnostic, not a propulsion flow.

Receipt boundary