chore: rename H7CAD to Open CAD Studio

Joining the OpenAEC Foundation (open-aec.com). Crate/struct become
OpenCADStudio, user-facing strings use the spaced "Open CAD Studio"
form, repo URLs point to HakanSeven12/open-cad-studio. Logo (window
icon + assets/logo.svg) redrawn with OCS initials. Drop examples/
binaries — unused.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/scene/camera.rs

@@ -9,7 +9,7 @@
 // Zoom:      adjusts `distance` (exponential feel).
 // Snap:      directly assigns yaw+pitch encoded as a quaternion (for ViewCube).
 //
-// Coordinate convention: Z-up world space (same as the rest of H7CAD).
+// Coordinate convention: Z-up world space (same as the rest of OpenCADStudio).
 
 use glam::{vec3, Mat4, Quat, Vec3};
 use iced::{Point, Rectangle};

src/scene/grip.rs

@@ -1,4 +1,4 @@
-//! H7CAD-style grip editing.
+//! OpenCADStudio-style grip editing.
 
 use acadrust::Handle;
 use glam::{Mat4, Vec3};
@@ -13,7 +13,7 @@ pub const GRIP_HALF_PX: f32 = 5.0;
 
 // ── Active drag state ─────────────────────────────────────────────────────
 
-/// Stored on `H7CAD` while a grip is being dragged.
+/// Stored on `OpenCADStudio` while a grip is being dragged.
 #[derive(Clone, Debug)]
 pub struct GripEdit {
     /// Handle of the entity being edited.

src/scene/hatch_patterns.rs

@@ -1,4 +1,4 @@
-// H7CAD hatch pattern catalog — built from `assets/patterns/H7CAD.pat`.
+// OpenCADStudio hatch pattern catalog — built from `assets/patterns/OpenCADStudio.pat`.
 //
 // Each `PatternEntry` wraps a parsed PAT pattern with:
 //   - `gpu`       — `HatchPattern::Pattern(families)` for the shader

src/scene/mod.rs

@@ -3914,7 +3914,7 @@ impl Scene {
             .document
             .views
             .iter()
-            .find(|v| v.name == "H7CAD_Camera_Model")
+            .find(|v| v.name == "OpenCADStudio_Camera_Model")
             .cloned();
         if let Some(view) = saved_view {
             return self.apply_camera_from_view_entry(&view, true);
@@ -3978,7 +3978,7 @@ impl Scene {
     /// Returns true if a valid sheet viewport was found and the camera was set.
     fn apply_sheet_viewport_camera(&mut self) -> bool {
         // Prefer our named View entry — survives DWG save without being overridden.
-        let view_name = format!("H7CAD_Camera_{}", self.current_layout);
+        let view_name = format!("OpenCADStudio_Camera_{}", self.current_layout);
         let saved_view = self
             .document
             .views
@@ -4094,7 +4094,7 @@ impl Scene {
             }
 
             // Also write to View table — survives DWG save without override.
-            self.write_camera_view_entry("H7CAD_Camera_Model", target_wcs, vd3, view_height);
+            self.write_camera_view_entry("OpenCADStudio_Camera_Model", target_wcs, vd3, view_height);
             true
         } else {
             let target_wcs = acadrust::types::Vector3 {
@@ -4102,7 +4102,7 @@ impl Scene {
                 y: cam.target.y as f64,
                 z: cam.target.z as f64,
             };
-            let view_name = format!("H7CAD_Camera_{}", self.current_layout);
+            let view_name = format!("OpenCADStudio_Camera_{}", self.current_layout);
 
             // Write back to the sheet viewport entity.
             let layout_block = self.current_layout_block_handle();

src/scene/pipeline/viewcube.rs

@@ -1,4 +1,4 @@
-// ViewCube wgpu pipeline — H7CAD-style interactive 3D navigation cube.
+// ViewCube wgpu pipeline — OpenCADStudio-style interactive 3D navigation cube.
 //
 // 26 selectable regions:  6 faces + 12 edges + 8 corners.
 // Phong shading + hover highlight passed as uniform.