Update MiniSW modeling features and tests

[wepar1212]

What changed

• Expanded the modeling and geometry feature set, including sweep, loft, reference geometry, ribs, termination conditions, chamfer, fillet, assembly, constraints, and drawing modules.
• Extended the AI operation parser, document rebuild flow, UI integration, persistence, and viewport behavior.
• Added comprehensive phase and feature regression tests.
• Added the bearing-bracket example model, build script, STL output, and supporting SolidWorks material assets.
• Updated the README and roadmap, and removed superseded task reports.

Validation

• Core integration suite: 94/94 passed.
• git diff --check: passed.

User impact

This packages the current MiniSW modeling work into a reviewable branch while keeping the default main branch unchanged.