Freeze SmoothLife model contract and fixtures

plans/README.md

@@ -28,7 +28,7 @@ The original source position is ~/Nextcloud/VecchiProgetti/SmoothLifeAll/
 4. **Inspectable by design.** `A`, `M`, `N`, target `S`, derivative/increment, kernels, scale outputs, history layers, and topology diagnostics are first-class channels.
 5. **Historical simulation behavior is exceptional and local.** There is no general legacy engine or compatibility profile. Only the explicitly retained RK4 relaxation reference, packed-unitary FFT, and sphere model are selectable; all other simulation behavior follows the new deterministic design.
 6. **Deterministic replay and continuation.** A run is identified by schema version, preset ID, seed, shape, backend, only the localized historical options relevant to that run, and step count. Restart-state files reset numerical history; exact checkpoints additionally store AB history, DT history/head, generation, and deterministic RNG state.
-7. **No runtime dependency on the old project.** Legacy catalogues are imported once and committed in the new schema.
+7. **No runtime dependency on the old project.** Bundled product presets are newly authored in the new schema; legacy sources remain provenance for the model contract, not preset input.
 8. **No steady-state allocation or readback.** Buffers and plans are reused; GPU readback is only for tests and explicit exports.
 
 ## Intended repository shape
@@ -39,7 +39,7 @@ smoothlife/
 ├── src/
 │   ├── lib.rs                    # raylib-free public core
 │   ├── main.rs                   # application entry point
-│   ├── config/                   # schema, validation, preset library/import
+│   ├── config/                   # schema, validation, preset library
 │   ├── field/                    # shapes, storage, indexing, inspection data
 │   ├── math/                     # curves, rules, kernels
 │   ├── integration/              # discrete, Euler, AB3, RK4