Kernel: concave edge fillets; whole smooth-loop blends of planar faces (cylinders and tori: pocket floors, plate outlines); rounding every edge of a convex planar body (sphere corners); healing after booleans (exact lines/arcs for intersection curves, coplanar faces merged, collinear edges joined); faces rebuilt on their stored surfaces

Oracle: 28/29.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

ROADMAP.md

@@ -9,7 +9,7 @@ features → parametric timeline) as an open, pure-Rust, agent-drivable applicat
 |---|---|
 | 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 | **25 / 29 parts match** Fusion's measurements — [docs/oracle.md](docs/oracle.md) |
+| Fusion oracle | **28 / 29 parts match** Fusion's measurements — [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) |
@@ -35,8 +35,9 @@ features → parametric timeline) as an open, pure-Rust, agent-drivable applicat
 
 ## 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.
+- Fillets and chamfers: straight edges (convex or concave) between planar faces with perpendicular
+  planar end faces; whole smooth loops of a planar face (pocket floors, plate outlines); every edge
+  of a convex planar body (sphere corners). Other corner configurations are not supported yet.
 - Booleans of curved bodies with coincident faces can fail (planar ones have an exact fallback);
   fully internal voids are not supported. Spheres are built from six pole-free patches so they
   combine reliably.