feat: preserve modeling intent across sketches, assemblies, and fabrication

Persist typed sketch dimensions and bounded ordered configuration rules in format 8. Use exact occurrence paths and source identity for editing, movement, appearance, and mass. Preserve sheet material regions through cutting, folding, and exact DXF export; retain nested cavities and material islands.

Validation: cargo xtask ci passed, including 368 engine tests, 178 UI tests, 68 UI scenarios, 136 kernel tests, and the 10-crate wasm check. Actual preview workflows and legacy format-7 origin-corner reopening were inspected.

xtask/data/fusion-ids.tsv

@@ -56,6 +56,7 @@ DisableAllContactCmd	contact.disable_all
 ContactSetCmd	contact.create
 FusionStartDesignConfigModeCmd	config.configure
 FusionShowDesignConfigPanelCmd	config.table
+FusionConfigurationRulesCmd	config.rules
 ConstructionPlaneOffsetFromPlaneCommand	construct.plane.offset
 ConstructionPlaneAtAngleCommand	construct.plane.at_angle
 ConstructionTangentPlaneCommand	construct.plane.tangent