feat: initial econ-skm-score v0.1.0 (econ.skm_score@0.1.0)

Standardkostenmodell (Methode des Nationalen Normenkontrollrats):

  eur_per_year = P × F × T × h

  P  population (Fallzahl)
  F  frequency per year (Frequenz)
  T  tariff in €/h (Tarif)
  h  time per case in hours (Zeitaufwand)

Each item preserves the formula string so an auditor can
reconstruct the calculation from the Hub audit log without
re-running the module.

Per-duty tier flags propagate via the Regel-der-niedrigsten-Stufe
(Studie §6.7): the aggregate tier_lowest is the worst tier among
the duties, so any T4 (qualitative signal) ingredient drags the
whole report down to T4. That is intentional — it prevents
methodologically weak inputs from masquerading as confidence.

Reuse-lens: SKM is EU- and OECD-anerkannt. The Niederländer (ATR),
UK (Regulatory Policy Committee) and EU REFIT all use this
methodology. This module is meaningful far beyond lawheatmap.

Pure in-WASM, zero filesystem, zero network.

Reserved for next versions:

  - 0.2: confidence intervals (P/F/T/h Streuung → output band)
  - 0.3: industry-tariff lookup (DESTATIS Bruttoverdienst-Reihen)

Signed-off-by: flemming-it <sf@flemming.it>

Cargo.toml

@@ -0,0 +1,36 @@
+[package]
+name = "econ_skm_score"
+version = "0.1.0"
+edition = "2024"
+authors = ["Dr. Stefan Flemming <chain@flemming.ai>"]
+license = "Apache-2.0"
+publish = false
+description = "F∆I module — Standardkostenmodell P×F×T×h per duty, total per norm"
+repository = "https://git.flemming.ws/chain-modules-econ/econ-skm-score"
+rust-version = "1.85"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+chain-module-sdk = { git = "https://git.flemming.ai/fai/chain-module-sdk-rust.git", branch = "main" }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+[profile.release]
+opt-level = "s"
+lto = true
+codegen-units = 1
+strip = "symbols"
+
+[lints.rust]
+unsafe_op_in_unsafe_fn = "warn"
+
+[lints.clippy]
+unwrap_used = "deny"
+expect_used = "deny"
+panic = "deny"
+print_stdout = "deny"
+print_stderr = "deny"
+
+[workspace]