Retire legacy reference data and the external command catalog (#302)

- Remove xtask/data/fusion-catalog.tsv and xtask/data/fusion-ids.tsv.
- Remove the legacy command-id table (crates/engine/src/legacy_ids.rs) and its use in
  find_command and in the shortcut, recents and pinned-command loaders. Only SolidCraft's
  dotted ids name commands; any other id is an unknown command.
- Boundary Fill's id becomes solid.boundary_fill.
- Replace the parity report with SolidCraft's own feature checklist: `cargo xtask features`
  writes docs/features.md from the command registry.
- docs/oracle.md, docs/step-import.md (corpus section) and docs/iges-import.md: reference
  results are being rebuilt on analytic and open-source (FreeCAD) values; see #292.
  `cargo xtask oracle` and `cargo xtask step-corpus [--iges]` write these placeholders.
- AGENTS.md, CLAUDE.md, CONTRIBUTING.md, README.md, ROADMAP.md and the book describe
  SolidCraft as independent, with reference tests on analytic values and open-source tools,
  and agents do not drive or extract data from commercial CAD products.


Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

Co-authored-by: Claude Opus 5.5 <[email protected]>

crates/engine/src/tests.rs

@@ -512,11 +512,22 @@ fn registry_is_consistent() {
     let n = ids.len();
     ids.dedup();
     assert_eq!(ids.len(), n, "duplicate command ids");
-    assert!(find_command("extrude").is_some(), "case-insensitive lookup");
+    assert_eq!(find_command("Solid.Extrude").map(|c| c.id), Some("solid.extrude"), "case-insensitive lookup");
     let s = Session::default();
     assert!(!find_command("sketch.line").unwrap().info(&s).enabled);
 }
 
+/// Only SolidCraft's own dotted ids name commands; other ids are unknown commands.
+#[test]
+fn only_own_ids_name_commands() {
+    for old in ["Extrude", "SketchCreate", "FusionFilletEdgesCommand"] {
+        assert!(find_command(old).is_none(), "{old}");
+        let mut s = Session::default();
+        let err = s.execute(old, &serde_json::json!({})).unwrap_err();
+        assert!(matches!(err, crate::EngineError::UnknownCommand(_)), "{old}: {err}");
+    }
+}
+
 #[test]
 fn sample_design_builds() {
     let mut s = Session::default();
@@ -2336,15 +2347,15 @@ fn boundary_fill_cells() {
     let mut s = Session::default();
     run(&mut s, "solid.box", json!({"length": 20, "width": 20, "height": 20, "body_name": "A"}));
     run(&mut s, "solid.box", json!({"corner": [10, 0, 0], "length": 20, "width": 20, "height": 20, "body_name": "B"}));
-    let r = run(&mut s, "SurfaceSculpt", json!({"tools": ["A", "B"], "cells": [[15, 10, 10]], "remove_tools": true}));
+    let r = run(&mut s, "solid.boundary_fill", json!({"tools": ["A", "B"], "cells": [[15, 10, 10]], "remove_tools": true}));
     let m = run(&mut s, "inspect.measure", json!({}));
     assert_eq!(m["body_count"], 1, "{r} {m}");
     assert!(rel(m["total"]["volume_mm3"].as_f64().unwrap_or(0.0), 10.0 * 20.0 * 20.0) < 1e-9);
     run(&mut s, "edit.undo", json!({}));
-    run(&mut s, "SurfaceSculpt", json!({"tools": ["A", "B"], "cells": [[5, 10, 10], [25, 10, 10]], "remove_tools": true}));
+    run(&mut s, "solid.boundary_fill", json!({"tools": ["A", "B"], "cells": [[5, 10, 10], [25, 10, 10]], "remove_tools": true}));
     let m = run(&mut s, "inspect.measure", json!({}));
     assert!(rel(m["total"]["volume_mm3"].as_f64().unwrap_or(0.0), 2.0 * 10.0 * 20.0 * 20.0) < 1e-9, "{m}");
-    assert!(s.execute("SurfaceSculpt", &json!({"tools": ["A"], "cells": [[100, 100, 100]]})).is_err());
+    assert!(s.execute("solid.boundary_fill", &json!({"tools": ["A"], "cells": [[100, 100, 100]]})).is_err());
 }
 
 /// Rectangles name their sides and corners, so they can be dimensioned without inspecting the