README: what FieldCraft does today, and the current status

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

README.md

@@ -1,13 +1,13 @@
 # FieldCraft
 
-An open-source, clean-room CAE modeling application in pure Rust: geometry to analysis-ready
-finite element models, with robust tetrahedral and hexahedral meshing, solver decks for Abaqus,
-Nastran and LS-DYNA, and its own linear static and modal solver. Desktop, browser and AI agents
-drive the same commands.
+An open-source, clean-room CAE application in pure Rust: from a parametric SolidCraft part to a
+verified finite element analysis, with tetrahedral and hexahedral meshing, its own implicit,
+explicit, thermal and lattice Boltzmann solvers, and decks for Abaqus, Nastran and LS-DYNA. The
+desktop app, the command line and AI agents (over MCP) drive the same commands.
 
-**Status:** early. The workspace, quality gates, the FE model, the command engine and the
-geometry boundary (SolidCraft's kernel and tessellator) are in place; meshing is next. See
-[ROADMAP.md](ROADMAP.md).
+**Status:** early but working end to end — open a part, mesh it, define the analysis, solve,
+see the results. Hex meshing is the centre of gravity; the next large step is the nonlinear
+implicit solver that contact, elastomers and composites need. See [ROADMAP.md](ROADMAP.md).
 
 ![An AI agent analyses an I-beam cantilever in FieldCraft over MCP: open, hex mesh, steel, clamp and tip load, solve, von Mises contours, the deformed shape and an orbit round it](docs/media/ibeam-analysis.gif)
 
@@ -17,6 +17,34 @@ solves, and shows the von Mises stress and the deformed shape (tip deflection 0.
 theory with shear 0.177 mm).
 [MP4](docs/media/ibeam-analysis.mp4) · regenerated by [tools/demo-video](tools/demo-video/README.md).
 
+## What it does today
+
+- **Geometry in:** SolidCraft designs (`.solidcraft`) with persistent face, edge and body names,
+  and face-tagged 3MF meshes; surface checks (weld, manifold, orientation, self-intersection).
+- **Meshing:** constrained Delaunay tetrahedra (tet4, tet10) with exact predicates and a
+  certified validity gate; structured hex by sweeping, revolving and mapping (hex8, hex20; 16 of
+  the 21 corpus parts mesh all-hex); 2D quad and tri meshes; quality metrics per element and set.
+- **Elements:** solids (tet4, tet10, wedge6, hex8 with incompatible modes, hex20 full and
+  reduced, hybrid u–p for near-incompressible materials), plane stress, plane strain and
+  axisymmetric, trusses, Timoshenko beams, MITC3/MITC4 shells, springs, dashpots and point masses.
+- **Model:** sets bound to geometry names, so they survive remeshing; isotropic and orthotropic
+  elasticity, J2 plasticity, Johnson–Cook damage, thermal properties; fixed, displacement,
+  symmetry and temperature conditions; forces, moments, pressure, gravity, centrifugal and heat
+  loads; reference points with kinematic and distributing couplings; undo, redo and a
+  text-diffable `.fieldcraft` file.
+- **Solvers:** linear static and frequency (supernodal Cholesky, block Lanczos); steady and
+  transient heat transfer and coupled thermal stress; explicit dynamics with plasticity, damage,
+  erosion and rigid walls; D3Q19 lattice Boltzmann flow with forces on the part's faces. Results
+  never depend on the thread count.
+- **Decks:** Abaqus, Nastran and LS-DYNA writers, each refusing by name what it cannot express.
+- **Results:** contours of stress, strain and displacement with a legend, deformed shapes, mode
+  shapes, explicit frames, probes and reaction sums; the analysis setup drawn in the viewport.
+- **Verification:** every capability is checked against closed forms and published benchmarks
+  (NAFEMS, MacNeal–Harder, Scordelis–Lo) in [`tests/oracle`](tests/oracle), with results frozen
+  so they cannot drift: [docs/oracle.md](docs/oracle.md).
+- **Driving it:** a desktop app in the Craft family's layout, a CLI, a JSON control channel and an
+  MCP server; every capability is a command ([docs/features.md](docs/features.md)).
+
 ## Build
 
 ```sh
@@ -32,6 +60,8 @@ Rust 1.95 or later, with the `wasm32-unknown-unknown` target for `cargo xtask ci
 ## Documentation
 
 - [Architecture](docs/architecture.md): crates, layers and the meshing pipeline
+- [Element library](docs/elements.md) and [verification and validation](docs/verification.md)
+- [Capability checklist](docs/parity.md) and [roadmap](ROADMAP.md)
 - [Libraries and licences](docs/adr/0001-libraries.md)
 - [AI agents (MCP)](docs/mcp.md): `claude mcp add fieldcraft -- /path/to/fieldcraft-cli mcp`
 - [Control protocol](docs/control-protocol.md): driving the desktop app