Public reference tests: analytic and FreeCAD expected values (#310)

The oracle no longer uses Fusion measurements. tests/oracle/<case>/ now holds the 76 recipes
(our own format, with recorded measurements and tool-specific fields removed) and an
expected.json per case:

- 55 analytic cases: closed-form values from tools/oracle-analytic/ (stdlib Python, formulas
  in each case's "method").
- 21 FreeCAD cases: the same recipe built with FreeCAD's public scripting API by
  tools/freecad-oracle/ (an external program, not a dependency), with a reference.stl for 20.

solvecraft-cli oracle compares body count, volume, area, centre of mass, bbox, face counts
where the geometry fixes them, and, against reference.stl, the sampled Hausdorff distance and
the principal moments (spatial.rs from #301). cargo xtask oracle reads tests/oracle, writes
docs/oracle.md with the source of each value, and supports known_failure marks for tracked
bugs. CI runs it on every PR; a manual workflow regenerates the FreeCAD values. step-corpus,
seam normalisation and the through-all emulation, which only existed to compare with Fusion,
are removed.

75/76 pass; 75-sm-bracket-holes is a known failure (#296).


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

Co-authored-by: bherbruck <bherbruck@herbrucks.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

apps/solvecraft-cli/src/main.rs

@@ -8,8 +8,7 @@
 //! solvecraft-cli exec <command> [json-params]                 run one command on an empty design
 //! solvecraft-cli commands                                     the command registry as JSON
 //! solvecraft-cli recipe <recipe.json>                         translate an oracle recipe to a script
-//! solvecraft-cli oracle <case-dir>...                         replay recipes and compare with measure.json
-//! solvecraft-cli step-corpus <case-dir>...                    import part.step and compare with measure.json
+//! solvecraft-cli oracle <case-dir>...                         replay recipes and compare with expected.json
 //! solvecraft-cli mcp [--in design|script] [--connect HOST:PORT] MCP server on stdio (docs/mcp.md)
 //! solvecraft-cli licences                                     SolveCraft's licence and the third-party licences
 //! solvecraft-cli icon --out F.png|F.ico [--size N]             the app icon (packaging; drawn, not a file)
@@ -20,7 +19,7 @@
 mod fuzz;
 mod oracle;
 mod recipe;
-mod seams;
+mod spatial;
 
 use std::process::ExitCode;
 
@@ -42,7 +41,6 @@ const USAGE: &str = "usage:
   solvecraft-cli recipe <recipe.json>
   solvecraft-cli oracle <case-dir>... [--json]
   solvecraft-cli fuzz [--from N] [--count N] [--jobs J] [--timeout S] [--steps N] [--minimise] [--out DIR] [--report FILE]
-  solvecraft-cli step-corpus <case-dir>... [--json] [--iges]
   solvecraft-cli mcp [--in design.solvecraft|script.json] [--connect 127.0.0.1:PORT]
   solvecraft-cli licences
   solvecraft-cli icon --out icon.png [--size 256] | --out icon.ico
@@ -73,7 +71,6 @@ fn main() -> ExitCode {
             recipe::to_script(&v).map(|s| println!("{}", pretty(&s)))
         }),
         Some("oracle") => oracle::run(&args[1..]),
-        Some("step-corpus") => oracle::step_corpus(&args[1..]),
         Some("fuzz") => fuzz::run(&args[1..]),
         Some("fuzz-one") => fuzz::one(&args[1..]),
         Some("mcp") => cmd_mcp(&args[1..]),