nordisk/knut

knut-popsim — crate card

Reverse-engineered (from source — verify, don't trust the name)

• One-line pitch: The canonical, pure-Rust, wasm-clean generator of the synthetic Swedish 11-million-person, 12-label population graph the knut demos load.
• Does: Holds only the model: the label set + real-register scale counts (LABELS, 12 labels A–L, Person the hub), deterministic geo placement (geo), per-label tie probabilities (PERSON_TIE_PROB, EKONOMISKT_BISTAND_RATE), and a generic in-memory PopGraph produced by simulate/schema from SimParams. Determinism is a contract — a seeded LCG (no rand) yields byte-identical graphs. No FalkorDB/Arrow/tonic/reqwest/tokio/filesystem deps, so it compiles for wasm32-unknown-unknown.
• Key deps: None mandatory — only optional serde (feature serde, for PopGraph (de)serialization). Deliberately dependency-light.
• Shape: lib only; small. Modules: lib (labels/params/simulate/schema/PopGraph), geo (placement). MIT OR Apache-2.0 licensed (unlike the Apache-2.0-only rest of the workspace).
• Observed role in the workspace: The single source of truth for the population model. knut-popviz re-exports LABELS/geo and adds the Arrow→FalkorDB/Iceberg load path; the facett wasm demo calls simulate/schema directly and renders PopGraph with no backend.

Fill in (one line each — only the human knows these)

• Primary consumer(s):
• Why it exists (vs the obvious alternative):
• Hard constraint (airgap / no-C-deps / no-FFI / pure-Rust / etc.):
• Release cadence & independence (rides a parent? own repo someday?):
• Status (production / prototype / experimental / stubbed):
• Must-NOT-change invariant:
• Biggest known gap or TODO:
• Anything a newcomer would get wrong about it: