cimery Sprint 1 — Rust 워크스페이스 + 전 계층 파이프라인

8개 크레이트 구현, cargo test 32개 전부 통과:
- core: Mm/M 단위 newtype, UnitExt 리터럴, FeatureError
- ir: GirderIR + 전 단면 파라미터(PSC-I/U/SteelBox/PlateI) serde JSON
- dsl: Girder builder + 검증 (경간 범위·count·spacing)
- kernel: GeomKernel trait + StubKernel (box mesh, AABB)
- incremental: dirty-tracking IncrementalDb (salsa 업그레이드 경로 주석)
- evaluator: 상태 없는 IR→kernel 브리지
- usd: USDA 1.0 텍스트 익스포트 (CimeryBridgeAPI·GirderAPI schema)
- viewer: wgpu 22 + winit 0.30 컬러 삼각형 (Sprint 1 proof-of-concept)

Sprint 2 다음 단계:
- opencascade-rs로 StubKernel 교체 (실제 PSC-I sweep)
- viewer에서 Girder Mesh 렌더 + 카메라 orbit

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cimery/crates/core/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name    = "cimery-core"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+serde     = { workspace = true }
+thiserror = { workspace = true }
+
+[dev-dependencies]
+serde_json = { workspace = true }

cimery/crates/core/src/lib.rs

@@ -0,0 +1,140 @@
+//! cimery-core — unit system, errors, domain enums.
+//!
+//! ADR-002 rule: all structural dimensions in `Mm`, alignment/road in `M`.
+//! Conversions MUST be explicit via `From`/`Into`. Never implicit.
+
+use serde::{Deserialize, Serialize};
+
+// ─── Unit types ──────────────────────────────────────────────────────────────
+
+/// Millimetres — all structural dimensions (flange thickness, web, height, spacing…).
+#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, Serialize, Deserialize)]
+pub struct Mm(pub f64);
+
+/// Metres — alignment stations, road offsets.
+#[derive(Debug, Clone, Copy, PartialEq, PartialOrd, Serialize, Deserialize)]
+pub struct M(pub f64);
+
+impl Mm {
+    #[inline] pub fn value(self) -> f64 { self.0 }
+    #[inline] pub fn new(v: f64) -> Self { Self(v) }
+}
+
+impl M {
+    #[inline] pub fn value(self) -> f64 { self.0 }
+    #[inline] pub fn new(v: f64) -> Self { Self(v) }
+}
+
+// Explicit conversions only — boundary must be visible in code.
+impl From<Mm> for M  { fn from(mm: Mm) -> M  { M(mm.0 / 1000.0) } }
+impl From<M>  for Mm { fn from(m: M)   -> Mm { Mm(m.0 * 1000.0) } }
+
+impl std::fmt::Display for Mm {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{} mm", self.0)
+    }
+}
+impl std::fmt::Display for M {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{} m", self.0)
+    }
+}
+
+/// Literal helpers: `1800.0_f64.mm()`, `40.0_f64.m()`
+pub trait UnitExt: Sized {
+    fn mm(self) -> Mm;
+    fn m(self)  -> M;
+}
+
+macro_rules! impl_unit_ext {
+    ($($t:ty),*) => {
+        $(impl UnitExt for $t {
+            fn mm(self) -> Mm { Mm(self as f64) }
+            fn m(self)  -> M  { M(self  as f64) }
+        })*
+    };
+}
+impl_unit_ext!(f64, f32, i32, i64, u32, u64);
+
+// ─── Errors ──────────────────────────────────────────────────────────────────
+
+/// All Feature build/validation errors.
+#[derive(Debug, thiserror::Error)]
+pub enum FeatureError {
+    /// A field value violated a constraint.
+    #[error("{path}: {message}")]
+    Validation { path: String, message: String },
+
+    /// A required field was not supplied.
+    #[error("{path}: required field is missing")]
+    MissingField { path: String },
+
+    /// Geometry generation failed.
+    #[error("geometry error: {0}")]
+    Geometry(String),
+}
+
+impl FeatureError {
+    pub fn validation(path: impl Into<String>, msg: impl Into<String>) -> Self {
+        Self::Validation { path: path.into(), message: msg.into() }
+    }
+    pub fn missing(path: impl Into<String>) -> Self {
+        Self::MissingField { path: path.into() }
+    }
+}
+
+// ─── Domain enums ─────────────────────────────────────────────────────────────
+
+/// Girder cross-section family.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SectionType {
+    PscI,
+    PscU,
+    SteelBox,
+    SteelPlateI,
+}
+
+/// Structural material grade.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum MaterialGrade {
+    C40,
+    C50,
+    Ss400,
+    Sm490,
+}
+
+// ─── Tests ────────────────────────────────────────────────────────────────────
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn unit_conversions_are_explicit() {
+        let mm = Mm(1000.0);
+        let m: M = mm.into();
+        assert!((m.value() - 1.0).abs() < f64::EPSILON);
+
+        let m2 = M(0.5);
+        let mm2: Mm = m2.into();
+        assert!((mm2.value() - 500.0).abs() < f64::EPSILON);
+    }
+
+    #[test]
+    fn unit_literals() {
+        let h  = 1800.0.mm();
+        let sp = 40.0.m();
+        assert_eq!(h.value(),  1800.0);
+        assert_eq!(sp.value(),   40.0);
+    }
+
+    #[test]
+    fn serde_roundtrip() {
+        let mm: Mm = 1234.5.mm();
+        let json   = serde_json::to_string(&mm).unwrap();
+        let mm2: Mm = serde_json::from_str(&json).unwrap();
+        assert!((mm.value() - mm2.value()).abs() < f64::EPSILON);
+    }
+}