feat: strengthen modeling, configuration, and assembly workflows

Preserve linked sketch identities through deterministic face projection and resizing. Fix origin-corner picking, persistent inline navigation, appearance editing, configuration styles, component properties, contact sweeps, sheet exports, analytic STEP offsets, and bounded rolling-ball fit accuracy.

Validated with full cargo xtask ci, native workflow screenshots, repeated enclosure replays, and analytic geometry regressions.

ROADMAP.md

@@ -1,6 +1,6 @@
 # SolveCraft roadmap
 
-Status as of **2026-10-10**. SolveCraft targets Fusion-style parametric modelling (sketch →
+Status as of **2026-10-11**. SolveCraft targets Fusion-style parametric modelling (sketch →
 features → parametric timeline) as an open, pure-Rust, agent-drivable application.
 
 ## At a glance
@@ -8,7 +8,7 @@ features → parametric timeline) as an open, pure-Rust, agent-drivable applicat
 | Question | Answer |
 |---|---|
 | Where are we? | **M0, M1, M13 done; M2, M5–M7, M9, M10, M14 in progress.** Sketch with solver and the full SKETCH create/modify set; extrude, revolve (two sides, symmetric, to object), fillet/chamfer (variable radius, chord length, a radius per edge, corner patches), holes, threads (cosmetic and modelled), patterns, mirror, shell (inside/outside/both), draft, loft, sweep, coil, split body and split face, delete face, construction planes, axes and points; persistent naming of faces and edges; parameters and configurations; components, joints, motion studies, exploded views; sheet metal and a plastic enclosure subset; STEP/IGES/3MF/STL/OBJ/DXF; autosave and crash recovery; desktop and browser (wasm) app, CLI, MCP server, oracle harness. |
-| Command parity (in scope) | **328 / 541 (61%)** in-scope commands; SOLID + SKETCH **185 / 291 (64%)** — [docs/parity.md](docs/parity.md) |
+| Command parity (in scope) | **331 / 541 (61%)** in-scope commands; SOLID + SKETCH **186 / 291 (64%)** — [docs/parity.md](docs/parity.md); registry breadth does not establish workflow or geometric parity |
 | Fusion oracle | **76 / 76 parts match** — [docs/oracle.md](docs/oracle.md) |
 | Tests | Solver, profiles, kernel booleans/blends/measures, expressions, timeline, persistent naming, file formats and migrations, assemblies, sheet metal, engine end-to-end, hostile-input fuzz over every command and headless UI scenarios. `cargo xtask ci` reports the current passing counts. |
 | Gates | `cargo xtask ci`: fmt, clippy -D warnings, tests, asset attribution, layering, wasm32 build — green |
@@ -48,18 +48,18 @@ headline counts in-scope tabs only and lists the deferred ones separately.
 | M0 | Vertical slice | done | — |
 | M1 | Sketch depth: done — projection/intersect/include as linked geometry (auto-project on faces, lost-reference warnings, break link), full SKETCH create/modify set (slots, polygons, tangent arcs/circles, ellipse, fit/control splines, conic, text, trim/extend/break, fillet/chamfer, offset, mirror, patterns, move/scale, blend curve, centerline), constraints incl. curvature and polygon with over-constraint refusal, driven/arc-length/linear-diameter dimensions, AutoConstrain, DXF/SVG insert, 3D sketch curves (Project To Surface, Intersection Curve, Isoparametric Curve, Spun Profile), exact free-form profiles (B-spline/NURBS edges, any spline degree, curves cut by crossings), sweeps and pipes along 3D sketch curves, canvases and decals, curvature combs | done | 4 |
 | M2 | Robust modelling: coplanar booleans in the kernel, holes (placed on faces and on sketch points), threads (cosmetic, then modelled), patterns, mirror, shell, draft, split, construction geometry | in progress | 16 |
-| M3 | General fillets and chamfers (curved edges, chains, vertex blends) | planned | 30 |
+| M3 | General fillets and chamfers (curved edges, chains, vertex blends); saddle rolling-ball surfaces now use continuous seam sections and arc-length fitting with shared contact boundaries and bounded accuracy checks | in progress | 30 |
 | M4 | Files: STEP import (done: all 29 Fusion STEP files — [docs/step-import.md](docs/step-import.md)), 3MF export and 3MF/STL import as mesh bodies (done), DXF sketches, OBJ import | in progress | 6 |
 | M5 | Persistent naming of faces and edges (plan/adr/0002): faces named from their history (sketch curve sides, caps, revolve sections, primitive sides, blends, pattern/mirror copies; split pieces numbered), edges by their faces; fillets/chamfers, sketches on faces, shell/draft/offset/replace faces, hole placements, joint origins and face appearances resolve by name first and warn when the entity split or vanished: done. sheet metal edges by base sketch line and flange side, shell inner faces, sweep and loft roles: done. Left: kernel-reported face history (exact through coincident surfaces) | in progress | 20 |
-| M6 | UI depth: selection feedback and origin (done), timeline editing (done: hover and selection highlight modifier faces, including fillets and chamfers; edit feature, history marker drag, reorder with dependency checks, suppress, rename, delete with dependents, re-resolved references), right-docked dialogs (done), live previews for every feature dialog (done), keyboard-first commands with on-canvas value boxes and sketch inline dimensions (done), drag manipulators with automatic join/cut (done: extrude incl. two sides, fillet, shell, hole depth, move, pattern spacing, revolve rotator; taper handle open), dark theme (done), right-click menu with Repeat (done), measure tool (done), section analysis (done), selection filter (done), drag-solve of sketch points (done); appearances, preferences | in progress | 6 |
+| M6 | UI depth: selection feedback and origin (done), timeline editing (done: hover and selection highlight modifier faces, including fillets and chamfers; edit feature, history marker drag, reorder with dependency checks, suppress, rename, delete with dependents, re-resolved references; redefining selections refreshes persistent edge/face references while retaining feature identity and dimension names), right-docked dialogs (done), live previews for every feature dialog (done), keyboard-first commands with on-canvas value boxes and sketch inline dimensions (done), drag manipulators with automatic join/cut (done: extrude incl. two sides, fillet, shell, hole depth, move, pattern spacing, revolve rotator; taper handle open), dark theme (done), right-click menu with Repeat (done), measure tool (done), section analysis (done), selection filter (done), drag-solve of sketch points (done); appearance controls now preserve body/face/component targeting, named transparent looks, reuse/search and override removal; preferences | in progress | 6 |
 | M7 | Sweep, loft (incl. to a point), rib and web (to next / depth), emboss (planar faces), thread (cosmetic, and modelled M3–M20 outside and inside: the ISO profile screwed in as a faceted cut), coil (smooth B-spline helical walls), pipe, pattern on path, patterns of bodies and components, replace face (parallel), align, remove, feature copy/paste: done. Left: emboss on curved faces, exact (unfaceted) modelled threads | in progress | 12 |
 | 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 (driving and motion studies stop where bodies in a set would pass through each other), Motion Study (joint values keyed along a timeline, playback, export of occurrence positions as JSON/CSV), Exploded views (automatic or by hand, shown without changing placements); 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. UI: ASSEMBLE panel dialogs for New Component, Joint (snaps on faces, edges, circles and vertices; animated motion preview; offsets, flip, limits), As-built Joint, Joint Origin, Rigid Group, Drive Joints (live slider), Motion Link and Interference (overlaps shown red); joints in the timeline and the Browser | in progress | 32 |
-| M10 | Sheet metal: flange (base, edge, contour), hem, unfold/refold, convert, flat pattern + DXF, rules: done (oracle 67-76). PLASTIC enclosure subset: Boss, Rib, Web, Lip/Groove, Snap Fit, Rest, Plastic Rules (library, edit, assign; rule draft and clearance as feature defaults): done, no Fusion oracle (licence), tested against hand-computed geometry. UI: SHEET METAL and PLASTIC tabs in Fusion's layout with dialogs (live preview, Edit Feature, pre-selection) for Flange, Hem, Unfold/Refold, Convert, Sheet Metal Rules, Create Flat Pattern (flat view with bend lines, bend table, DXF export), Boss, Lip/Groove, Snap Fit, Rest, Manage and Assign Plastic Rules; Fold (bend along a sketch line) | in progress | 36 |
+| 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 (driving and motion studies stop where bodies in a set would pass through each other), Motion Study (joint values keyed along a timeline, playback, export of occurrence positions as JSON/CSV), Exploded views (automatic or by hand, shown without changing placements); interference, per-component physical properties; STEP with assembly structure. Physical properties now measure material-aware component/occurrence placements, descendants and repeated instances, including pending moves and body reassignment offsets; contact geometry and automatic exploded centres respect those offsets. 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. UI: ASSEMBLE panel dialogs for New Component, Joint (snaps on faces, edges, circles and vertices; animated motion preview; offsets, flip, limits), As-built Joint, Joint Origin, Rigid Group, Drive Joints (live slider), Motion Link and Interference (overlaps shown red); joints in the timeline and the Browser | in progress | 32 |
+| M10 | Sheet metal: flange (base, edge, contour), hem, unfold/refold, convert, flat pattern + DXF, rules: done (oracle 67-76). PLASTIC enclosure subset: Boss, Rib, Web, Lip/Groove, Snap Fit, Rest, Plastic Rules (library, edit, assign; rule draft and clearance as feature defaults): done, no Fusion oracle (licence), tested against hand-computed geometry. UI: SHEET METAL and PLASTIC tabs in Fusion's layout with dialogs (live preview, Edit Feature, pre-selection) for Flange, Hem, Unfold/Refold, Convert, Sheet Metal Rules, Create Flat Pattern (flat view with bend lines, bend table CSV/JSON and DXF export with exact circle/arc/line cutouts), Boss, Lip/Groove, Snap Fit, Rest, Manage and Assign Plastic Rules; Fold (bend along a sketch line) | in progress | 36 |
 | M11 | 2D drawings | deferred | — |
 | M12 | Release: installers, signing, docs, performance | planned | 16 |
-| M14 | Configurations: a table of rows (parameter expressions and feature suppressions per row) switched with config.activate (undoable, all or nothing), kept through parameter renames and feature deletes (config.configure, config.table, config.column/row/activate). Left: configuration rules, per-row materials and appearances | in progress | 4 |
-| M13 | Never lose work: atomic saves (temporary file, flush, rename; a crash at any moment leaves the old file or the new one) with the replaced version kept as `<file>.bak`; autosave of unsaved changes to the recovery folder every 5 minutes (preference) and after big operations, only when something changed; "Recover unsaved design?" on the next launch (`doc.recovery_list`, `doc.recover`, `doc.recovery_discard`); a kill-mid-save test (process killed while saving a 0.5 MB design 25 times). File format: `"format": "solvecraft/2"`, older formats upgraded step by step (`doc::format`), newer ones refused with a message, out-of-range numbers and broken placements refused; a corpus of designs saved by M0, components-era, joints-era and current builds (apps/solvecraft-cli/tests/corpus) that must open and evaluate as saved; damaged and hostile variants (truncation, bit flips, hostile values, removed keys, repeated features, deep nesting) never panic | done | 6 |
+| M14 | Configurations: a table of rows (parameter expressions and feature suppressions per row) switched with config.activate (undoable, all or nothing), kept through parameter renames and feature deletes (config.configure, config.table, config.column/row/activate). Per-row body materials and appearances (library looks, custom colour/opacity and clearing overrides), undoable activation and save/reopen: done. Left: configuration rules and component/face style columns | in progress | 4 |
+| M13 | Never lose work: atomic saves (temporary file, flush, rename; a crash at any moment leaves the old file or the new one) with the replaced version kept as `<file>.bak`; autosave of unsaved changes to the recovery folder every 5 minutes (preference) and after big operations, only when something changed; "Recover unsaved design?" on the next launch (`doc.recovery_list`, `doc.recover`, `doc.recovery_discard`); a kill-mid-save test (process killed while saving a 0.5 MB design 25 times). File format: `"format": "solvecraft/7"`, older formats upgraded step by step (`doc::format`), newer ones refused with a message, out-of-range numbers and broken placements refused; a corpus of designs saved by M0, components-era, joints-era and current builds (apps/solvecraft-cli/tests/corpus) that must open and evaluate as saved; damaged and hostile variants (truncation, bit flips, hostile values, removed keys, repeated features, deep nesting) never panic | done | 6 |
 
 ## Known limitations
 
@@ -89,7 +89,9 @@ headline counts in-scope tabs only and lists the deferred ones separately.
   that cut through curved faces (trimmed faces after booleans) are split onto the surface first.
 - 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,
+  product names, colours and assemblies; analytic offsets on planes, cylinders, cones, spheres
+  and regular tori are read exactly (signed/nested distances, units and face sense). Freeform
+  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.
 - Persistent naming (plan/adr/0002) names faces from their history and edges by their faces;
@@ -97,12 +99,33 @@ headline counts in-scope tabs only and lists the deferred ones separately.
   face history (exact through coincident surfaces) is not wired in yet.
 - Modelled threads are cut as a faceted body (curved faces within 1/200 of the pitch); Extrude
   and Revolve To Object on a curved face cut the tool back to the target's surface.
-- Free-form curves cut at a tangent touch (no clean crossing) enter that profile as polylines.
+- Explicit sketch breaks preserve exact ellipses, fit/control splines (including high degrees)
+  and conics; analytic trim/break also sees free-form cutters. Free-form curves cut at a tangent
+  touch (no clean crossing) enter that profile as polylines.
   Sweeps along 3D sketch curves follow their polyline (smooth walls when the path is smooth).
 - Shell and offset faces work on bodies of planes, cylinders, cones and spheres (convex or not:
   filleted boxes, bosses, domes, countersinks); draft on convex planar bodies and on walls (planes, cylinders → cones) between caps; lofts through three or more sections are smooth (B-spline sides through every section), two
   sections ruled.
 
+- Sketch corner tools: fillet and all three chamfer modes pick a connected corner even when
+  its endpoint overlaps the fixed origin or a loose point. Ordinary drawing still snaps to
+  the origin; clicked UI regressions verify geometry, closed profiles and undo.
+- Face projection: closed boundaries have a deterministic outer-first order. Refresh matches
+  existing geometry before assigning positions, retaining saved curve IDs and constraints
+  across enumeration changes and resize, including concentric circles. Ambiguous identities
+  retain the last geometry and report a lost reference; permutation matching is bounded.
+- Inline sketch dimensions: Tab and Shift+Tab cycle within the active shape's value boxes,
+  selecting visited values for replacement. Expression completion retains forward-Tab
+  priority; real keyboard regressions cover rectangles, lines and single-value circles.
+- Rolling-ball fillet accuracy: independent offset-cylinder tee references check surface
+  distance, actual trimmed tessellation, supporting-cylinder contacts and tangency at two
+  scales. The measured trimmed-part error is below 0.0001 mm; this is an analytic geometry
+  check, not a new Fusion oracle result. Under-resolved fits return an error.
+- Contact driving checks the trajectory between clear endpoints, including linked joints,
+  playback and sparse motion exports. Checks use bounded tessellation samples, not exact
+  continuous collision detection; local thin walls and small details remain limitations.
+  See [contact-set limits and recovery](docs/contact-sets.md).
+
 ## Kernel
 
 truck (Apache-2.0) behind our own `kernel` crate, with our own blend operation and boolean