Scope decisions (in-scope parity headline, deferred tabs), STEP import and kernel notes in ROADMAP/plan

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

ROADMAP.md

@@ -8,13 +8,31 @@ features → parametric timeline) as an open, pure-Rust, agent-drivable applicat
 | Question | Answer |
 |---|---|
 | Where are we? | **M0 done; M1/M2 in progress.** Sketch with solver, extrude (taper, two-sided, through all), revolve, fillet/chamfer, holes, patterns, mirror, shell, draft, loft, sweep, split, construction planes, parameters that rebuild the timeline, STEP/STL export, desktop and browser (wasm) app with Fusion-style selection (hover/selected highlights, origin planes, click-to-pick sketch planes, multi-select, window/crossing box selection, animated view cube), CLI, MCP server, oracle harness. |
-| Command parity (SOLID + SKETCH toolbar) | **57 / 291 (20%)** — [docs/parity.md](docs/parity.md) |
-| Fusion oracle | **29 / 29 parts match** Fusion's measurements — [docs/oracle.md](docs/oracle.md) |
+| Command parity (in scope) | **139 / 541 (26%)** in-scope commands; SOLID + SKETCH **102 / 291 (35%)** — [docs/parity.md](docs/parity.md) |
+| Fusion oracle | **38 / 66 parts match** (batch 1: 29/29; batch 2 in progress) — [docs/oracle.md](docs/oracle.md) |
 | Tests | 85 (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, wasm32 build — 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 |
 
+## Scope (owner decision, 2026-10-07)
+
+In scope, in priority order:
+1. SOLID and SKETCH (now).
+2. Parameters / functional constraints: user parameters with units and expressions (+-*/, ^,
+   parentheses, sin/cos/sqrt/min/max/floor/ceil/round, unit conversion), model parameters
+   d1, d2… for every dimension and feature input, references between parameters with a
+   dependency graph and cycle detection, re-evaluation on change, comments, favourites,
+   CSV/JSON import and export.
+3. Components and assemblies with joints (M9).
+4. SHEET METAL: flange, contour flange, bend, unfold/refold, flat pattern with DXF export, sheet
+   metal rules (thickness, K-factor, bend radius) (M10).
+5. A small PLASTIC subset for enclosures, after sheet metal: Boss, Rib, Web, Lip/Groove, Snap Fit.
+
+Deferred until further notice: MESH, FORM (T-splines), SURFACE beyond what solids need, PCB / 3D
+PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings. The parity report's
+headline counts in-scope tabs only and lists the deferred ones separately.
+
 ## Milestones
 
 | # | Milestone | Status | Hours left |
@@ -27,10 +45,10 @@ features → parametric timeline) as an open, pure-Rust, agent-drivable applicat
 | M5 | Persistent naming of faces and edges | planned | 20 |
 | M6 | UI depth: selection feedback and origin (done), timeline editing (done: edit feature, history marker drag, reorder with dependency checks, suppress, rename, delete with dependents, re-resolved references), live previews, measure tool, section view, drag-solve | in progress | 16 |
 | M7 | Sweep, loft, rib, web, emboss, thread, coil, pipe | planned | 24 |
-| M8 | Surface workspace | planned | 30 |
-| M9 | Components and assemblies (Fusion-style): New Component / Create Components from Bodies, active component, per-component origin/bodies/sketches/timeline entries, occurrences with transforms, Copy/Paste vs Paste New, nested Browser tree with visibility and isolate; Ground, Move/Copy of occurrences, joints (rigid, revolute, slider, cylindrical, pin-slot, planar, ball) by joint origins with limits and Drive Joints, As-built Joint, Rigid Group, contact sets later; interference, per-component physical properties; STEP with assembly structure. Groundwork done: the document is a component tree (features and bodies carry a component, active component, New Component, Create Components from Bodies) | planned | 40 |
-| M10 | Sheet metal | planned | 30 |
-| M11 | 2D drawings | planned | 30 |
+| M8 | Surface workspace | deferred | — |
+| M9 | Components and assemblies (Fusion-style): New Component / Create Components from Bodies, active component, per-component origin/bodies/sketches/timeline entries, occurrences with transforms, Copy/Paste vs Paste New, nested Browser tree with visibility and isolate; Ground, Move/Copy of occurrences, joints (rigid, revolute, slider, cylindrical, pin-slot, planar, ball) by joint origins with limits and Drive Joints, As-built Joint, Rigid Group, contact sets later; interference, per-component physical properties; STEP with assembly structure. Groundwork done: component tree, occurrences with transforms (instances, Paste New), world placement, active component as authoring frame, ground, Capture/Revert Position, moving bodies and sketches | in progress | 32 |
+| M10 | Sheet metal: flange, contour flange, bend, unfold/refold, flat pattern + DXF, rules (thickness, K-factor, bend radius); then the PLASTIC enclosure subset (Boss, Rib, Web, Lip/Groove, Snap Fit) | planned | 36 |
+| M11 | 2D drawings | deferred | — |
 | M12 | Release: installers, signing, docs, performance | planned | 16 |
 
 ## Known limitations
@@ -43,12 +61,13 @@ features → parametric timeline) as an open, pure-Rust, agent-drivable applicat
   voids are not supported. Spheres are built from six pole-free patches so they
   combine reliably.
 - Mass properties come from fine tessellation (curved faces within ~1e-4 relative).
-- STEP import reads solids (B-rep with analytic and B-spline geometry), units, product names,
-  colours and assemblies; offset surfaces and pcurve-only edges are not read yet, and assembly
-  components are flattened into bodies (the tree is kept for M9).
+- STEP import (our own reader, crates/kernel/src/step_in; all 29 Fusion STEP files pass
+  `cargo xtask step-corpus`) reads solids (B-rep with analytic and B-spline geometry), units,
+  product names, colours and assemblies; offset surfaces and pcurve-only edges are not read yet,
+  and assembly components are flattened into bodies. Closed periodic faces (torus, B-spline
+  bands) are split in two for meshing; measure() uses a finer tolerance for small radii.
 - No persistent naming (fillet edges are re-found by position).
-- Shell and draft work on convex bodies with planar faces; loft is ruled (no tangency end conditions).
-- Dialogs have no live preview of the result yet.
+- Shell works on planar bodies (convex or not), draft on convex planar bodies; loft is ruled.
 
 ## Kernel