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]>

CLAUDE.md

@@ -16,8 +16,7 @@ compatibility notes.
 
 ## 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).
+   and the relevant `plan/architecture.md` section.
 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
@@ -42,20 +41,22 @@ People trust SolidCraft with their designs; a crash loses their work. **This out
   `#![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. (`tools/freecad-oracle/` runs
-  FreeCAD as a separate program through its public scripting API to compute reference values;
+- **Independent.** SolidCraft is independent. Behaviour is designed from public documentation,
+  general CAD conventions and user feedback. Reference tests use analytic values and open-source
+  tools. Never copy another product's code, icons, artwork, help text, tooltips, templates or
+  materials. File formats come from public specifications.
+- **No commercial CAD products.** Agents must not drive, script, automate or extract data from
+  commercial CAD products (Fusion, SolidWorks, Onshape, …) for this project: no test data,
+  measurements, command lists, ids or files produced with them.
+- **Never read, copy or link GPL/LGPL/AGPL code**: OpenCASCADE, FreeCAD (incl. planegcs),
+  SolveSpace, CadQuery/OCP, LibreCAD, QCAD — don't even read their sources. (`tools/freecad-oracle/`
+  runs FreeCAD as a separate program through its public scripting API to compute reference values;
   nothing from FreeCAD is linked, vendored or shipped.) The sketch solver and the blend
   operations are our own.
-- **Assets — absolutely essential.** SolidCraft 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.
+- **Assets — absolutely essential.** SolidCraft contains **no iconography, images, fonts or
+  artwork from commercial CAD products — 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 commercial CAD 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 = our own dotted, lower-case id `<area>.<thing>[.<variant>]` such as
@@ -103,10 +104,10 @@ before the draft is verified.
   `solvecraft-cli snapshot script.json --out shot.png`, `solvecraft-cli commands`.
 - Reference tests: `cargo xtask oracle` replays `tests/oracle/*/recipe.json` and compares with
   each case's `expected.json` (analytic or FreeCAD values; writes `docs/oracle.md`). Expected
-  values never come from Fusion or any other commercial CAD product.
+  values never come from a commercial CAD product.
 - 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`.
+`ROADMAP.md` (committed) tracks status, milestones and estimates. Update it whenever a
+milestone task lands. `cargo xtask features` regenerates `docs/features.md` (SolidCraft's
+commands by area, from the registry) when commands are added or renamed.