ModelCraft foundation: workspace, quality gates, FE model, command engine, geometry boundary

A pure-Rust CAE modeling workspace following the SolidCraft conventions:
- modelcraft-model: nodes and elements by label with hostile-input validation
- modelcraft-geometry: SolidCraft's kernel (pinned git dependency) behind our own API;
  tessellation into a face-tagged boundary surface for volume meshing
- modelcraft-engine: CommandSpec registry, Session::execute with rollback and panic guard,
  scripts and a journal
- modelcraft-cli: list commands, run scripts
- xtask: layers (only geometry may use solidcraft-*), assets, licences, tests, wasm, ci
- AGENTS.md, architecture, ADR 0001 (libraries and licences), roadmap, CI

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

Cargo.toml

@@ -0,0 +1,73 @@
+[workspace]
+resolver = "3"
+members = ["crates/*", "apps/*", "xtask"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2024"
+license = "MIT OR Apache-2.0"
+rust-version = "1.95"
+authors = ["ModelCraft contributors"]
+repository = "https://github.com/jyviko/modelcraft"
+
+[workspace.dependencies]
+# internal
+modelcraft-model = { path = "crates/model" }
+modelcraft-geometry = { path = "crates/geometry" }
+modelcraft-engine = { path = "crates/engine" }
+
+# foundation
+thiserror = "2"
+serde = { version = "1", features = ["derive"] }
+serde_json = { version = "1", features = ["float_roundtrip"] }
+log = "0.4"
+
+# Geometry: SolidCraft's B-rep kernel (MIT OR Apache-2.0), pinned. Only crates/geometry uses it
+# (plan/adr/0001-libraries.md).
+solidcraft-geom = { git = "https://github.com/bherbruck/solidcraft", rev = "de1479029dd6821cffd28b70688a58e7f61f0cfd" }
+solidcraft-kernel = { git = "https://github.com/bherbruck/solidcraft", rev = "de1479029dd6821cffd28b70688a58e7f61f0cfd" }
+
+[workspace.lints.rust]
+unsafe_code = "forbid"
+
+[workspace.lints.clippy]
+dbg_macro = "warn"
+todo = "warn"
+too_many_arguments = "allow"
+type_complexity = "allow"
+# `!(x > tol)` is our idiom for "not a usable number" (NaN-safe).
+neg_cmp_op_on_partial_ord = "allow"
+
+[profile.dev.package."*"]
+opt-level = 2
+
+[profile.dev]
+opt-level = 1
+
+# Tests and lints (`cargo xtask ci`, GitHub CI). Debug assertions are off because truck's
+# debug-only checks reject valid geometry (SolidCraft builds its tests the same way).
+[profile.ci]
+inherits = "dev"
+opt-level = 1
+debug = "line-tables-only"
+debug-assertions = false
+overflow-checks = true
+incremental = false
+
+[profile.ci.package."*"]
+opt-level = 2
+
+[profile.release]
+opt-level = 3
+lto = "thin"
+codegen-units = 16
+debug = "line-tables-only"
+
+# SolidCraft builds truck with local fixes (its vendor/ directory). Patches don't reach a
+# dependent workspace, so ModelCraft applies the same ones from the same pinned commit; keep this
+# list and the rev in step with SolidCraft's [patch.crates-io].
+[patch.crates-io]
+truck-shapeops = { git = "https://github.com/bherbruck/solidcraft", rev = "de1479029dd6821cffd28b70688a58e7f61f0cfd" }
+truck-stepio = { git = "https://github.com/bherbruck/solidcraft", rev = "de1479029dd6821cffd28b70688a58e7f61f0cfd" }
+truck-meshalgo = { git = "https://github.com/bherbruck/solidcraft", rev = "de1479029dd6821cffd28b70688a58e7f61f0cfd" }
+matext4cgmath = { git = "https://github.com/bherbruck/solidcraft", rev = "de1479029dd6821cffd28b70688a58e7f61f0cfd" }