# SIM Series Practical Closure

Status:

```text
SIM_SERIES_PRACTICAL_CLOSURE_MIXED__ADAPTIVE_UPDATE_PILOT_READY__CHECKPOINT_AND_COMPRESSION_BOUNDARIES__NO_PHYSICAL_CLAIM
```

The first practical ITHKOR-SIM branch is closed as mixed but useful.

## What Is Ready

Adaptive update budget is ready for a real-simulation pilot.

Evidence:

- SIM1 wins over 5/5 non-oracle controls in the initial synthetic toy.
- SIM4 passes 3/3 counted structured toy worlds.
- SIM4 uses held-out world families relative to SIM1's initial toy.

Allowed next use:

```text
Use ITHKOR-inspired adaptive update allocation in a real or semi-real
simulation pilot, with frozen observables and strict controls.
```

## What Is Not Ready

Checkpoint placement is not ready:

- SIM2 counted pass: 0/3.
- SIM2B counted pass: 0/3.
- Uniform-time checkpointing beats information-event checkpointing in the
  current smooth-interpolation objective.

Compression is not ready as a broad policy:

- SIM3 counted pass: 0/3.
- SIM3B counted pass: 2/3.
- Hybrid detail compression is a scoped candidate, not a default.

## Real-Simulation Pilot Scope

Original SIM closure limited the next real-simulation pilot to adaptive update
only. A later scope upgrade, SIM2C/SIM3C, changes the practical pilot plan:

- SIM2C passes temporal-jet checkpoint records in 3/3 counted structured worlds.
- SIM3C passes observable-capsule compression in 3/3 counted structured worlds.
- SIM2/SIM2B and SIM3/SIM3B remain valid boundary results for simpler policies.

Updated practical pilot scope:

1. Use adaptive update budget from SIM1/SIM4.
2. Test temporal-jet checkpoint records from SIM2C.
3. Test observable-capsule compression from SIM3C.
4. Compare against uniform, geometric-gradient, source-only, random and
   shuffled-information controls.
5. Report stress/noise rows separately.
6. Treat wins as compute/error engineering wins, not physics.

## Blocked Claims

SIM closure does not allow:

- a claim that ITHKOR-SIM is a universal simulator;
- a claim that it improves physical correctness in real systems;
- a claim that the universe is a simulation;
- spacetime, gravity, physical time or quantum-gravity claims.