Add the modelcraft-mesh crate (empty: error type only) (#3)

So the predicates and quality tasks can add modules in parallel without both creating the crate.


Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

Co-authored-by: jyviko <2501648+jyviko@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Cargo.lock

@@ -367,6 +367,14 @@ dependencies = [
  "thiserror 2.0.21",
 ]
 
+[[package]]
+name = "modelcraft-mesh"
+version = "0.1.0"
+dependencies = [
+ "modelcraft-model",
+ "thiserror 2.0.21",
+]
+
 [[package]]
 name = "modelcraft-model"
 version = "0.1.0"

Cargo.toml

@@ -14,6 +14,7 @@ repository = "https://github.com/jyviko/modelcraft"
 # internal
 modelcraft-model = { path = "crates/model" }
 modelcraft-geometry = { path = "crates/geometry" }
+modelcraft-mesh = { path = "crates/mesh" }
 modelcraft-engine = { path = "crates/engine" }
 
 # foundation

crates/mesh/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "modelcraft-mesh"
+description = "ModelCraft's meshing: robust predicates, surface preparation, tetrahedral and hexahedral meshing, quality metrics"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[lints]
+workspace = true
+
+[dependencies]
+modelcraft-model = { workspace = true }
+thiserror = { workspace = true }

crates/mesh/src/lib.rs

@@ -0,0 +1,22 @@
+//! Meshing: robust geometric predicates, boundary surface preparation, tetrahedral and
+//! hexahedral volume meshing, and element quality.
+//!
+//! Every algorithm here is implemented from the papers cited in its module docs (see
+//! `docs/meshing/literature.md`); no GPL-family code is read or used. Meshing decisions use exact
+//! predicates, results are deterministic, and every iterative stage is bounded.
+#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
+#![forbid(unsafe_code)]
+
+#[derive(Debug, Clone, PartialEq, thiserror::Error)]
+pub enum Error {
+    #[error("invalid input: {0}")]
+    Invalid(String),
+    #[error("limit reached: {0}")]
+    Limit(String),
+    #[error("meshing failed: {0}")]
+    Failed(String),
+    #[error(transparent)]
+    Model(#[from] modelcraft_model::Error),
+}
+
+pub type Result<T> = std::result::Result<T, Error>;

docs/architecture.md

@@ -20,7 +20,7 @@ crates in strictly lower layers.
 |---|---|---|---|
 | L0 | `modelcraft-model` | Solver-neutral FE model: nodes, elements by label; materials, sections, sets, BCs, loads and steps as they land. Knows no file format. | started |
 | L1 | `modelcraft-geometry` | The only door to SolidCraft: B-rep bodies, measures, tessellation into a face-tagged `SurfaceMesh`. No SolidCraft type in its API. | started |
-| L1 | `modelcraft-mesh` | Surface preparation (weld, watertightness, feature edges), robust predicates, Delaunay tetrahedralization and refinement, Voronoi-based optimization, hex meshing, quality metrics. | planned |
+| L1 | `modelcraft-mesh` | Surface preparation (weld, watertightness, feature edges), robust predicates, Delaunay tetrahedralization and refinement, Voronoi-based optimization, hex meshing, quality metrics. | started |
 | L1 | `modelcraft-solver` | Element formulations, assembly, sparse linear static and modal solution. | planned |
 | L1 | `modelcraft-decks` | Abaqus input, Nastran bulk data and LS-DYNA keyword readers and writers, to and from `model`. | planned |
 | L1 | `modelcraft-render` | Display data (meshes, contour maps) without a GPU dependency. | planned |