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 <[email protected]>
Co-authored-by: Claude Opus 5.5 <[email protected]>

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>;