Roll semantic SCAD object naming through reusable libraries

[brainboxemb]

Goal

After the shared SCAD convention adopts semantic domain-object names ending in _obj, review the reusable SCAD libraries and align their public/private APIs where appropriate.

Target repositories

At minimum review:

• brainboxemb/lib.scad.hub75;
• brainboxemb/lib.scad.clamps;
• brainboxemb/lib.scad.mechint;
• brainboxemb/lib.scad.forge and lib.scad.util only where code is domain-specific enough that a semantic object name is clearer than generic obj.

Rule

• domain objects: panel_obj, clamp_obj, dovetail_obj, etc.;
• role-qualified objects: source_*_obj, target_*_obj, etc.;
• bare obj only for genuinely generic infrastructure.

Important

Do not mechanically rename released public API parameters without considering OpenSCAD named-argument compatibility and release/migration impact.

Track each library change with its own repository issue/PR and release evidence as needed.

Depends on the shared convention update tracked in #121.

[brainboxemb]

Reviewed for Migration 010. The _obj API/naming rollout remains separate.

Migration 010 must make the current SCAD coding convention discoverable to a blank agent, but it does not mechanically rename public library APIs.

Tracking migration: #128.