diff --git a/AGENTS.md b/AGENTS.md
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+# SolveCraft — instructions for agents
+
+SolveCraft is a clean-room, open-source, pure-Rust parametric 3D CAD application in the style of
+Autodesk Fusion: sketches with a constraint solver, a parametric timeline of features, a B-rep
+kernel, and a desktop UI that agents can drive. Siblings with the same conventions live next to
+it in `storytold/`: `cadcraft` (AutoCAD-style, the closest relative), `photocraft`, `vectorcraft`,
+`gridcraft`, `designcraft`, `wordcraft`, `deckcraft`, `soundcraft`. Repos don't share code; when
+code is adapted from a sibling (MIT OR Apache-2.0) it is noted in ATTRIBUTION.md.
+
+## Start every session here
+1. Read `plan/STATUS.md` (current milestone, next task), then the task in `plan/execution-plan.md`
+   and the relevant `plan/architecture.md` section. Behaviour reference: `plan/fusion/`
+   (`menu-tree.json` is Fusion's toolbar dump; `oracle/*/` are parts built in Fusion with their
+   recipes and measurements).
+2. Kernel and library decisions: `plan/adr/0001-geometry-kernel.md` (what we may depend on, what
+   is rejected for licence reasons).
+3. Follow the autonomous operation protocol (`plan/execution-plan.md` §6). Don't stop to ask
+   unless it lists the decision as the owner's.
+
+`plan/` is gitignored (local only).
+
+## Never crash
+People trust SolveCraft with their designs; a crash loses their work. **This outranks feature work.**
+- **No panics in non-test code:** no `unwrap()`, `expect()`, `panic!`, `unreachable!`, `todo!`,
+  `unimplemented!`; no `unsafe` (`unsafe_code = "forbid"`).
+- **Errors are `Result<T, E>`** through the crate's error type and `?`. An unfinished feature
+  returns an error ("not supported yet: …"); it never panics.
+- **Input-derived numbers are hostile** (command parameters, design files, control-channel
+  input): `get()` not `[i]`, finite checks, caps on sizes and loop counts.
+- **Third-party kernel calls are guarded:** everything that calls `truck` goes through
+  `solvecraft_kernel::guard`, which turns a panic into `KernelError::Internal`.
+- **Last-resort guard:** `Session::execute` runs every command under `catch_unwind`; an escaped
+  panic restores the design and reports `EngineError::Internal`.
+- **Prove it:** every crash fix lands with a regression test (see `hostile_params_never_panic`).
+- Every production crate root carries
+  `#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]`.
+
+## Non-negotiables
+- **Clean-room.** Fusion may be *observed* black-box (its UI, its toolbar dump, parts built in it
+  and their measurements, kept under `plan/fusion/`, never committed). Never copy Autodesk icons,
+  artwork, help text, tooltips, templates or materials, and never commit files produced by
+  Fusion. Command ids and command names are used as identifiers only (`xtask/data/fusion-catalog.tsv`
+  holds ids and names, nothing else). File formats come from public specifications. **Never read,
+  copy or link GPL/LGPL/AGPL code**: OpenCASCADE, FreeCAD (incl. planegcs), SolveSpace,
+  CadQuery/OCP, LibreCAD, QCAD — don't even read their sources. The sketch solver and the blend
+  operations are our own.
+- **Assets — absolutely essential.** SolveCraft contains **no Autodesk iconography, images,
+  fonts or artwork — ever.** Every icon is drawn in code (`crates/ui-egui/src/icons.rs`). Any
+  file asset must be original or openly licensed and **must have a row in ATTRIBUTION.md**
+  (`cargo xtask assets` enforces it). Screenshots of Autodesk software are never committed.
+  Breaking this rule is the most serious mistake you can make in this repo.
+- **Everything is a command.** User-visible behaviour = a command in `crates/engine/src/cmd/*`
+  (`CommandSpec`: id = Fusion's command id where Fusion has the command, else a dotted id; label;
+  toolbar tab and panel; icon; shortcut; params doc; `enabled`; JSON `run`) + tests. The toolbar,
+  dialogs, sketch tools, palette, scripts, CLI and control channel all reach the same commands.
+- **Programmatic calls never open dialogs.** `engine.execute` runs the JSON form; only toolbar
+  clicks (`ui.start`) start interactive tools and dialogs, which then run commands.
+- **Layering** is enforced by `cargo xtask layers`: L0 `geom` → L1 `sketch`, `kernel`, `render`
+  → L2 `doc` → L3 `io` → L4 `engine` → L5 `ui-egui` → apps. Nothing below L5 depends on
+  egui/eframe/winit/wgpu/rfd. **The UI crate is swappable.** Only `crates/kernel` may use `truck`.
+- **The UI is thin**: panels read engine state and act through `app.run(id, params)` /
+  `app.start(id)`. Colours come from `theme::Tokens`.
+- **Rust only.** Units are millimetres and radians internally; Z is up.
+- **Quality gates** before every commit: `cargo xtask ci` (fmt, clippy -D warnings, tests,
+  assets, layers). Commit after every feature arc that builds.
+
+## Running and looking at the app
+- `cargo run --release -p solvecraft -- --sample --control PORT` (sample design + control channel).
+  Pick a free port. Without a display, run it under `Xvfb :99` with `DISPLAY=:99`.
+- Drive it with JSON lines on `127.0.0.1:PORT` (see `docs/control-protocol.md`):
+  - `{"id":1,"method":"engine.execute","params":{"command":"Extrude","params":{"distance":20}}}`
+  - `{"id":2,"method":"ui.start","params":{"command":"SketchCreate"}}` then `ui.click {x, y}`
+  - `{"id":3,"method":"ui.screenshot","params":{"path":"/tmp/shot.png"}}` then read the PNG.
+- **For UI work, look at the result** (screenshot, read the PNG). Without a window use
+  `ui.render` or `solvecraft-cli snapshot`.
+- Headless: `solvecraft-cli run script.json --out part.step`, `solvecraft-cli eval design.solvecraft`,
+  `solvecraft-cli snapshot script.json --out shot.png`, `solvecraft-cli commands`.
+- Fusion oracle: `cargo xtask oracle` replays `plan/fusion/oracle/*/recipe.json` and compares
+  with Fusion's `measure.json` (writes `docs/oracle.md`).
+- Build with `CARGO_TARGET_DIR=<repo>/target`. Windows: `cargo xwin build --release --target x86_64-pc-windows-msvc -p solvecraft`.
+
+## Roadmap
+`ROADMAP.md` (committed) tracks status, milestones, parity and estimates. Update it whenever a
+milestone task lands. `cargo xtask parity` recomputes command parity in `docs/parity.md`;
+`cargo xtask oracle` recomputes `docs/oracle.md`.
diff --git a/ATTRIBUTION.md b/ATTRIBUTION.md
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+# Attribution
+
+Every non-code asset in this repository (images, icons, fonts, example parts) is listed here with
+its author, source and licence. `cargo xtask assets` (part of `cargo xtask ci`) fails if an asset
+file is missing from this table.
+
+**Policy (mandatory):** SolveCraft contains **no Autodesk iconography, images, artwork, fonts,
+templates, materials or help text.** Every asset is original work by SolveCraft contributors or
+third-party material under an open licence. Screenshots of Autodesk software are never committed.
+
+Generated-in-code assets are original and have no file to list:
+- the UI icon set (`crates/ui-egui/src/icons.rs`);
+- the view cube, navigation bar and timeline glyphs (`crates/ui-egui/src/viewport.rs`,
+  `crates/ui-egui/src/timeline.rs`).
+
+## Files
+
+| File | Author | Source | Licence |
+|---|---|---|---|
+| docs/screenshots/sample-plate.png | SolveCraft contributors | screenshot of SolveCraft itself (`solvecraft --sample`) | MIT OR Apache-2.0 |
+
+## Code adapted from sibling projects
+
+| SolveCraft file | Adapted from | Licence |
+|---|---|---|
+| xtask/src/layers.rs | CADCraft `xtask/src/layers.rs` (dependency layering rules and tests) | MIT OR Apache-2.0 |
+| apps/solvecraft/src/control_server.rs | CADCraft `apps/cadcraft/src/control_server.rs` (loopback JSON-lines server) | MIT OR Apache-2.0 |
+| crates/ui-egui/src/lib.rs (screenshot queue, synthetic input) | CADCraft `crates/ui-egui/src/lib.rs` | MIT OR Apache-2.0 |
+| crates/ui-egui/src/control.rs (method dispatch and screenshot saving) | CADCraft `crates/ui-egui/src/control.rs` | MIT OR Apache-2.0 |
+| crates/ui-egui/src/gpu.rs (paint-callback structure) | CADCraft `crates/ui-egui/src/gpu.rs` | MIT OR Apache-2.0 |
+| LICENSE-MIT, LICENSE-APACHE (licence text) | CADCraft | — |
diff --git a/CLAUDE.md b/CLAUDE.md
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+++ b/CLAUDE.md
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+# SolveCraft — instructions for agents
+
+SolveCraft is a clean-room, open-source, pure-Rust parametric 3D CAD application in the style of
+Autodesk Fusion: sketches with a constraint solver, a parametric timeline of features, a B-rep
+kernel, and a desktop UI that agents can drive. Siblings with the same conventions live next to
+it in `storytold/`: `cadcraft` (AutoCAD-style, the closest relative), `photocraft`, `vectorcraft`,
+`gridcraft`, `designcraft`, `wordcraft`, `deckcraft`, `soundcraft`. Repos don't share code; when
+code is adapted from a sibling (MIT OR Apache-2.0) it is noted in ATTRIBUTION.md.
+
+## Start every session here
+1. Read `plan/STATUS.md` (current milestone, next task), then the task in `plan/execution-plan.md`
+   and the relevant `plan/architecture.md` section. Behaviour reference: `plan/fusion/`
+   (`menu-tree.json` is Fusion's toolbar dump; `oracle/*/` are parts built in Fusion with their
+   recipes and measurements).
+2. Kernel and library decisions: `plan/adr/0001-geometry-kernel.md` (what we may depend on, what
+   is rejected for licence reasons).
+3. Follow the autonomous operation protocol (`plan/execution-plan.md` §6). Don't stop to ask
+   unless it lists the decision as the owner's.
+
+`plan/` is gitignored (local only).
+
+## Never crash
+People trust SolveCraft with their designs; a crash loses their work. **This outranks feature work.**
+- **No panics in non-test code:** no `unwrap()`, `expect()`, `panic!`, `unreachable!`, `todo!`,
+  `unimplemented!`; no `unsafe` (`unsafe_code = "forbid"`).
+- **Errors are `Result<T, E>`** through the crate's error type and `?`. An unfinished feature
+  returns an error ("not supported yet: …"); it never panics.
+- **Input-derived numbers are hostile** (command parameters, design files, control-channel
+  input): `get()` not `[i]`, finite checks, caps on sizes and loop counts.
+- **Third-party kernel calls are guarded:** everything that calls `truck` goes through
+  `solvecraft_kernel::guard`, which turns a panic into `KernelError::Internal`.
+- **Last-resort guard:** `Session::execute` runs every command under `catch_unwind`; an escaped
+  panic restores the design and reports `EngineError::Internal`.
+- **Prove it:** every crash fix lands with a regression test (see `hostile_params_never_panic`).
+- Every production crate root carries
+  `#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]`.
+
+## Non-negotiables
+- **Clean-room.** Fusion may be *observed* black-box (its UI, its toolbar dump, parts built in it
+  and their measurements, kept under `plan/fusion/`, never committed). Never copy Autodesk icons,
+  artwork, help text, tooltips, templates or materials, and never commit files produced by
+  Fusion. Command ids and command names are used as identifiers only (`xtask/data/fusion-catalog.tsv`
+  holds ids and names, nothing else). File formats come from public specifications. **Never read,
+  copy or link GPL/LGPL/AGPL code**: OpenCASCADE, FreeCAD (incl. planegcs), SolveSpace,
+  CadQuery/OCP, LibreCAD, QCAD — don't even read their sources. The sketch solver and the blend
+  operations are our own.
+- **Assets — absolutely essential.** SolveCraft contains **no Autodesk iconography, images,
+  fonts or artwork — ever.** Every icon is drawn in code (`crates/ui-egui/src/icons.rs`). Any
+  file asset must be original or openly licensed and **must have a row in ATTRIBUTION.md**
+  (`cargo xtask assets` enforces it). Screenshots of Autodesk software are never committed.
+  Breaking this rule is the most serious mistake you can make in this repo.
+- **Everything is a command.** User-visible behaviour = a command in `crates/engine/src/cmd/*`
+  (`CommandSpec`: id = Fusion's command id where Fusion has the command, else a dotted id; label;
+  toolbar tab and panel; icon; shortcut; params doc; `enabled`; JSON `run`) + tests. The toolbar,
+  dialogs, sketch tools, palette, scripts, CLI and control channel all reach the same commands.
+- **Programmatic calls never open dialogs.** `engine.execute` runs the JSON form; only toolbar
+  clicks (`ui.start`) start interactive tools and dialogs, which then run commands.
+- **Layering** is enforced by `cargo xtask layers`: L0 `geom` → L1 `sketch`, `kernel`, `render`
+  → L2 `doc` → L3 `io` → L4 `engine` → L5 `ui-egui` → apps. Nothing below L5 depends on
+  egui/eframe/winit/wgpu/rfd. **The UI crate is swappable.** Only `crates/kernel` may use `truck`.
+- **The UI is thin**: panels read engine state and act through `app.run(id, params)` /
+  `app.start(id)`. Colours come from `theme::Tokens`.
+- **Rust only.** Units are millimetres and radians internally; Z is up.
+- **Quality gates** before every commit: `cargo xtask ci` (fmt, clippy -D warnings, tests,
+  assets, layers). Commit after every feature arc that builds.
+
+## Running and looking at the app
+- `cargo run --release -p solvecraft -- --sample --control PORT` (sample design + control channel).
+  Pick a free port. Without a display, run it under `Xvfb :99` with `DISPLAY=:99`.
+- Drive it with JSON lines on `127.0.0.1:PORT` (see `docs/control-protocol.md`):
+  - `{"id":1,"method":"engine.execute","params":{"command":"Extrude","params":{"distance":20}}}`
+  - `{"id":2,"method":"ui.start","params":{"command":"SketchCreate"}}` then `ui.click {x, y}`
+  - `{"id":3,"method":"ui.screenshot","params":{"path":"/tmp/shot.png"}}` then read the PNG.
+- **For UI work, look at the result** (screenshot, read the PNG). Without a window use
+  `ui.render` or `solvecraft-cli snapshot`.
+- Headless: `solvecraft-cli run script.json --out part.step`, `solvecraft-cli eval design.solvecraft`,
+  `solvecraft-cli snapshot script.json --out shot.png`, `solvecraft-cli commands`.
+- Fusion oracle: `cargo xtask oracle` replays `plan/fusion/oracle/*/recipe.json` and compares
+  with Fusion's `measure.json` (writes `docs/oracle.md`).
+- Build with `CARGO_TARGET_DIR=<repo>/target`. Windows: `cargo xwin build --release --target x86_64-pc-windows-msvc -p solvecraft`.
+
+## Roadmap
+`ROADMAP.md` (committed) tracks status, milestones, parity and estimates. Update it whenever a
+milestone task lands. `cargo xtask parity` recomputes command parity in `docs/parity.md`;
+`cargo xtask oracle` recomputes `docs/oracle.md`.
diff --git a/NOTICE b/NOTICE
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+++ b/NOTICE
@@ -0,0 +1,21 @@
+SolveCraft
+Copyright (c) 2026 SolveCraft contributors.
+Licensed under the MIT License or the Apache License, Version 2.0, at your option
+(LICENSE-MIT, LICENSE-APACHE).
+
+Third-party material
+
+Software dependencies are listed in Cargo.lock. The geometry kernel builds on the truck crates
+(truck-modeling, truck-shapeops, truck-meshalgo, truck-stepio, truck-topology and their
+dependencies, https://github.com/ricosjp/truck), licensed under the Apache License 2.0 and used
+unmodified as libraries.
+
+Some code is adapted from sibling projects in the storytold family (CADCraft), which are
+licensed MIT OR Apache-2.0; ATTRIBUTION.md lists the files.
+
+None of the bundled assets come from third parties: every icon is drawn in code. The per-file
+list is in ATTRIBUTION.md.
+
+SolveCraft is an independent project and is not affiliated with, sponsored by or endorsed by
+Autodesk, Inc. Autodesk and Fusion are trademarks of Autodesk, Inc.; they are used here only to
+describe compatibility goals.
diff --git a/README.md b/README.md
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+# SolveCraft
+
+SolveCraft is an open-source parametric 3D CAD application written in Rust, in the style of
+Autodesk Fusion: sketch on a plane, constrain and dimension the sketch, turn profiles into solids
+with extrude and revolve, round edges, combine bodies, and change a parameter to watch the whole
+timeline rebuild. It is a clean-room implementation (see [CLAUDE.md](CLAUDE.md)) and part of the
+storytold "craft" family.
+
+![SolveCraft with the sample plate](docs/screenshots/sample-plate.png)
+
+**Status: early (milestone M0 done, M1 in progress).** See [ROADMAP.md](ROADMAP.md),
+[docs/parity.md](docs/parity.md) (command parity with Fusion's Design workspace) and
+[docs/oracle.md](docs/oracle.md) (parts built in Fusion, rebuilt and measured in SolveCraft).
+
+## What works
+
+- **Sketches** on the origin planes, offset planes or planar faces: lines, rectangles (2-point,
+  3-point, centre), circles (centre, 2-point, 3-point), arcs (3-point, centre), polygons, slots
+  and points; construction geometry.
+- **Constraints and dimensions** solved by our own solver (damped Gauss–Newton with
+  degree-of-freedom analysis): coincident, horizontal/vertical, parallel, perpendicular, tangent,
+  equal, concentric, collinear, midpoint, symmetry, fix; linear, aligned, horizontal, vertical,
+  radius, diameter and angle dimensions driven by parameters. Over-constraining edits are
+  rejected; fully constrained geometry turns black.
+- **Profiles** found automatically, including regions split by lines and holes inside outlines.
+- **Features** on a parametric timeline: extrude (one side, flipped, symmetric, two-sided, start
+  offset; new body, join, cut, intersect), revolve, fillet and chamfer (straight convex edges),
+  box, cylinder, sphere, torus, combine, move. The timeline rebuilds incrementally from the first
+  changed feature; it can be rolled back, and features can be suppressed, renamed, edited and
+  deleted.
+- **Parameters** with unit-aware expressions (`2 * width + 5 mm`, `angle / 2`).
+- **Files**: designs as JSON (`.solvecraft`), export to STEP, STL (binary/ASCII) and OBJ.
+- **Desktop app** (egui + wgpu): toolbar with workspace tabs, browser, timeline, 3D viewport with
+  view cube and navigation bar, sketch tools, feature dialogs, command palette, and a JSON-lines
+  control channel so agents and tests can drive it.
+- **Headless CLI** `solvecraft-cli`: run command scripts, measure (volume, area, centre of mass,
+  face/edge/vertex counts), export, render PNG snapshots, replay Fusion oracle recipes.
+
+## Build and run
+
+```sh
+cargo run --release -p solvecraft -- --sample          # desktop app with a sample part
+cargo run --release -p solvecraft-cli -- commands      # the command registry
+cargo run --release -p solvecraft-cli -- run examples/bracket.json --out bracket.step
+cargo run --release -p solvecraft-cli -- snapshot examples/bracket.json --out bracket.png
+cargo xtask ci                                          # fmt, clippy, tests, assets, layers
+```
+
+Windows builds: `cargo xwin build --release --target x86_64-pc-windows-msvc -p solvecraft`.
+
+## Scripts
+
+A script is a JSON list of commands, the same ones the UI runs:
+
+```json
+{"commands": [
+  {"command": "SketchCreate", "params": {"plane": "XY"}},
+  {"command": "ShapeRectangleTwoPoint", "params": {"p0": [0, 0], "p1": [40, 30]}},
+  {"command": "Extrude", "params": {"distance": 20}},
+  {"command": "FusionFilletEdgesCommand", "params": {"edges": [[0, 0, 10]], "radius": 3}}
+]}
+```
+
+## Architecture
+
+| Layer | Crates | Role |
+|---|---|---|
+| L0 | `geom` | vectors, planes, profiles, meshes and their measures |
+| L1 | `sketch`, `kernel`, `render` | constraint solver and profiles; the B-rep kernel boundary (truck); view math and CPU rasterizer |
+| L2 | `doc` | parameters, expressions, the feature timeline and its incremental evaluation |
+| L3 | `io` | design files, STL/OBJ/STEP export |
+| L4 | `engine` | the session and the command registry (everything is a command) |
+| L5 | `ui-egui` | the swappable desktop front end |
+| apps | `solvecraft`, `solvecraft-cli` | desktop app, headless CLI |
+
+## Licence
+
+MIT OR Apache-2.0, at your option. SolveCraft is not affiliated with Autodesk; Fusion is a
+trademark of Autodesk, Inc.
diff --git a/ROADMAP.md b/ROADMAP.md
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+++ b/ROADMAP.md
@@ -0,0 +1,48 @@
+# SolveCraft roadmap
+
+Status as of **2026-10-07**. SolveCraft targets Fusion-style parametric modelling (sketch →
+features → parametric timeline) as an open, pure-Rust, agent-drivable application.
+
+## At a glance
+
+| Question | Answer |
+|---|---|
+| Where are we? | **M0 (vertical slice) done.** Sketch with solver, extrude/revolve/fillet/chamfer/cut, parameters that rebuild the timeline, STEP/STL export, desktop app, CLI, oracle harness. |
+| Command parity (SOLID + SKETCH toolbar) | **46 / 291 (16%)** — [docs/parity.md](docs/parity.md) |
+| Fusion oracle | **2 / 29 parts match** Fusion's measurements (16 need features not built yet) — [docs/oracle.md](docs/oracle.md) |
+| Tests | 60 (solver, profiles, kernel booleans/blends/measures, expressions, timeline, file formats, camera, engine end-to-end, hostile-input fuzz over every command) |
+| Gates | `cargo xtask ci`: fmt, clippy -D warnings, tests, asset attribution, layering — green |
+| Weighted parity estimate | **≈ 5%** of Fusion's Design workspace by importance (sketch + basic solids are the core, but surfaces, assemblies, sheet metal, CAM, drawings are untouched) |
+| Time to a useful alpha (M0–M6) | ≈ **150 agent hours** remain |
+
+## Milestones
+
+| # | Milestone | Status | Hours left |
+|---|---|---|---|
+| M0 | Vertical slice | done | — |
+| M1 | Sketch depth, oracle sketch cases (arcs, taper, two-sided, sketch modify tools) | in progress | 16 |
+| M2 | Robust modelling: coplanar booleans in the kernel, holes, patterns, mirror, shell, draft, split, construction geometry | planned | 24 |
+| M3 | General fillets and chamfers (curved edges, chains, vertex blends) | planned | 30 |
+| M4 | Files: STEP import, mesh import, DXF sketches, 3MF | planned | 16 |
+| M5 | Persistent naming of faces and edges | planned | 20 |
+| M6 | UI depth: profile shading, selection filters, measure tool, section view, edit dialogs, drag-solve | planned | 24 |
+| M7 | Sweep, loft, rib, web, emboss, thread, coil, pipe | planned | 24 |
+| M8 | Surface workspace | planned | 30 |
+| M9 | Assemblies and joints | planned | 40 |
+| M10 | Sheet metal | planned | 30 |
+| M11 | 2D drawings | planned | 30 |
+| M12 | Release: installers, signing, docs, performance | planned | 16 |
+
+## Known limitations
+
+- Fillets and chamfers: straight convex edges between planar faces with perpendicular planar end
+  faces; two blended edges may not share a corner yet.
+- Booleans of bodies with coincident faces fail unless they come from extrudes (where the tool is
+  extended automatically); fully internal voids are not supported.
+- Mass properties come from fine tessellation (curved faces within ~1e-4 relative).
+- No STEP import yet; no persistent naming (fillet edges are re-found by position).
+
+## Kernel
+
+truck (Apache-2.0) behind our own `kernel` crate, with our own blend operation and boolean
+retry/validation; see `plan/adr/0001-geometry-kernel.md` (local) — summary in README.
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
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+++ b/docs/control-protocol.md
@@ -0,0 +1,46 @@
+# Control protocol
+
+`solvecraft --control PORT` (or `SOLVECRAFT_CONTROL_PORT=PORT`) listens on `127.0.0.1:PORT` for
+JSON lines. Each request is one line `{"id": …, "method": "…", "params": {…}}`; each reply is one
+line `{"id": …, "ok": true, "result": …}` or `{"id": …, "ok": false, "error": "…"}`. Requests are
+handled on the UI thread between frames; pointer and keyboard input is injected as real egui
+events, one pointer event per frame.
+
+## Engine
+
+| Method | Params | Result |
+|---|---|---|
+| `engine.execute` | `command`: command id, `params`: JSON object | the command's result |
+| `engine.script` | `commands`: `[{command, params}, …]` | results, stops at the first error |
+| `engine.commands` | — | every command: id, label, tab, panel, icon, shortcut, params doc, enabled |
+| `document.inspect` | `measure?`: bool | parameters, timeline (errors, timings), bodies, sketches, selection |
+
+Commands never open dialogs when run this way. `solvecraft-cli commands` prints the same registry.
+
+## UI
+
+| Method | Params | Notes |
+|---|---|---|
+| `ui.inspect` | — | UI state, viewport rect, camera, active tool/dialog, hover, renderer, timings |
+| `ui.set` | any `UiState` field (`tab`, `perspective`, `showGrid`, `hiddenBodies`, …) | |
+| `ui.view` | `view`: `front`, `back`, `top`, `bottom`, `left`, `right`, `iso`, `home`, `fit` | |
+| `ui.start` | `command` | like a toolbar click: starts the sketch tool or dialog for the command |
+| `ui.click` | `x`, `y` (screen points), `button?`: left/right/middle, `shift?` | real pointer input |
+| `ui.move` | `x`, `y` | |
+| `ui.scroll` | `x`, `y`, `delta?` | wheel zoom at the cursor |
+| `ui.key` | `key` (egui key name, `Enter`, `Escape`…), `cmd?`, `shift?` | |
+| `ui.text` | `text` | typed text |
+| `ui.screenshot` | `path?` | PNG of the window (needs a presented frame) |
+| `ui.render` | `path`, `width?`, `height?` | CPU render of the model with the current camera (no window needed) |
+| `ui.resize` | `width`, `height` | |
+| `app.quit` | — | |
+
+## Example
+
+```text
+{"id":1,"method":"engine.execute","params":{"command":"SketchCreate","params":{"plane":"XY"}}}
+{"id":2,"method":"engine.execute","params":{"command":"ShapeRectangleTwoPoint","params":{"p0":[0,0],"p1":[40,30]}}}
+{"id":3,"method":"engine.execute","params":{"command":"Extrude","params":{"distance":20}}}
+{"id":4,"method":"engine.execute","params":{"command":"FusionFilletEdgesCommand","params":{"edges":[[0,0,10]],"radius":3}}}
+{"id":5,"method":"ui.screenshot","params":{"path":"/tmp/part.png"}}
+```
diff --git a/docs/oracle.md b/docs/oracle.md
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--- /dev/null
+++ b/docs/oracle.md
@@ -0,0 +1,37 @@
+# Fusion oracle
+
+Generated by `cargo xtask oracle`. Each case is a part built in Fusion (recipe and measurements kept locally in `plan/fusion/oracle/`, not committed). SolveCraft replays the recipe through its command engine and compares body count, volume and area (relative tolerance 1e-3) and face/edge/vertex counts (exact).
+
+**2 / 29 cases pass** (16 need features not implemented yet).
+
+| Case | Result | Notes |
+|---|---|---|
+| 01-box | pass |  |
+| 02-cylinder | pass |  |
+| 03-box-through-hole | FAIL | step 11 (Extrude): invalid parameters for `Extrude`: `distance` must be a number or an expression |
+| 04-revolve-vase | not yet | recipe: sketch entity type `arc_three_point` is not supported yet |
+| 05-taper-extrude | FAIL | volume_mm3: got 48000.0 want 61814.82596; area_mm2: got 8000.0 want 9676.91517 |
+| 06-symmetric-extrude | FAIL | volume_mm3: got 15000.0 want 30000.0; area_mm2: got 4100.0 want 6200.0 |
+| 07-fillet-all-edges | FAIL | step 8 (FusionFilletEdgesCommand): not supported yet: the faces at the edge ends must be planar |
+| 08-chamfer | FAIL | step 8 (FusionChamferCommand): not supported yet: the faces at the edge ends must be perpendicular to the edge |
+| 09-shell | not yet | recipe: feature op `shell` is not supported yet |
+| 10-rect-pattern-holes | not yet | recipe: feature op `rectangular_pattern` is not supported yet |
+| 11-circular-pattern-flange | not yet | recipe: feature op `circular_pattern` is not supported yet |
+| 12-mirror-feature | not yet | recipe: feature op `mirror` is not supported yet |
+| 13-combine-join | not yet | recipe: feature op `combine` is not supported yet |
+| 14-combine-cut | not yet | recipe: sketch entity type `arc_three_point` is not supported yet |
+| 15-combine-intersect | not yet | recipe: sketch entity type `arc_three_point` is not supported yet |
+| 16-sweep | not yet | recipe: sketch entity type `arc_three_point` is not supported yet |
+| 17-loft | not yet | recipe: feature op `construction_plane` is not supported yet |
+| 18-hole-features | not yet | recipe: feature op `hole` is not supported yet |
+| 19-l-bracket-constrained | FAIL | step 8 (ConstraintHorizontalVertical): invalid parameters for `ConstraintHorizontalVertical`: `line` must be a curve id |
+| 20-slot-constrained | not yet | recipe: sketch entity type `arc_center_start_sweep` is not supported yet |
+| 21-draft | not yet | recipe: feature op `draft` is not supported yet |
+| 22-split-body | not yet | recipe: feature op `construction_plane` is not supported yet |
+| 23-bracket-multifeature | not yet | recipe: feature op `construction_plane` is not supported yet |
+| 24-user-parameters | FAIL | step 11 (ConstraintCoincident): invalid parameters for `ConstraintCoincident`: `a` must be a point reference |
+| 25-sketch-triangle | FAIL | step 5 (ConstraintCoincident): invalid parameters for `ConstraintCoincident`: `a` must be a point reference |
+| 26-sketch-belt | not yet | recipe: constraint `horizontal_points` is not supported yet |
+| 27-sketch-trapezoid | FAIL | step 9 (ConstraintHorizontalVertical): invalid parameters for `ConstraintHorizontalVertical`: `line` must be a curve id |
+| 28-blind-pocket-fillets | FAIL | step 15 (FusionFilletEdgesCommand): not supported yet: the blend is larger than the neighbouring faces |
+| 29-two-sided-and-partial-revolve | FAIL | step 7 (Extrude): invalid parameters for `Extrude`: `distance` must be a number or an expression |
diff --git a/docs/screenshots/sample-plate.png b/docs/screenshots/sample-plate.png
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index 00000000..d35c51ce
Binary files /dev/null and b/docs/screenshots/sample-plate.png differ
diff --git a/examples/bracket.json b/examples/bracket.json
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index 00000000..80b26577
--- /dev/null
+++ b/examples/bracket.json
@@ -0,0 +1,14 @@
+{"commands": [
+  {"command": "ChangeParameterCommand", "params": {"name": "width", "expression": "60 mm"}},
+  {"command": "ChangeParameterCommand", "params": {"name": "thickness", "expression": "6 mm"}},
+  {"command": "SketchCreate", "params": {"plane": "XZ", "name": "Profile"}},
+  {"command": "DrawPolyline", "params": {"points": [[0, 0], [40, 0], [40, 6], [6, 6], [6, 30], [0, 30]], "closed": true, "ids": ["a", "b", "c", "d", "e", "f"]}},
+  {"command": "SketchStop", "params": {}},
+  {"command": "Extrude", "params": {"distance": "width", "direction": "negative", "body_name": "Bracket"}},
+  {"command": "FusionFilletEdgesCommand", "params": {"edges": [[40, 30, 6]], "radius": 2}},
+  {"command": "SketchCreate", "params": {"plane": "XY", "name": "Holes"}},
+  {"command": "CircleCenterRadius", "params": {"center": [25, 15], "diameter": 8}},
+  {"command": "CircleCenterRadius", "params": {"center": [25, 45], "diameter": 8}},
+  {"command": "SketchStop", "params": {}},
+  {"command": "Extrude", "params": {"distance": "thickness", "operation": "cut"}}
+]}