engine: samples can build their geometry from a SolidCraft script

A sample may carry a SolidCraft script (the corpus recipe form) whose design
opens before its commands run, and its script sees the design's bodies.
fieldcraft-engine now builds fieldcraft-geometry with its scripts feature.
The start screen scrolls its sample list, and a test keeps the file.sample
form's choices in step with the samples.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

crates/engine/Cargo.toml

@@ -10,7 +10,8 @@ workspace = true
 
 [dependencies]
 fieldcraft-model = { workspace = true }
-fieldcraft-geometry = { workspace = true }
+# Samples build their geometry from SolidCraft scripts (sample.rs).
+fieldcraft-geometry = { workspace = true, features = ["scripts"] }
 fieldcraft-mesh = { workspace = true }
 fieldcraft-io = { workspace = true }
 fieldcraft-decks = { workspace = true }
@@ -27,5 +28,3 @@ log = { workspace = true }
 
 [dev-dependencies]
 zip = { workspace = true }
-# Multi-body designs from SolidCraft scripts in tests.
-fieldcraft-geometry = { workspace = true, features = ["scripts"] }