Sprint 11/12/13 — 선택하이라이트 + 저장/로드 + Tauri앱 스켈레톤

Sprint 11 (Selection highlight + 단면 UI):
- FeatureDraw: CPU 정점 저장, update_highlight() — 선택 시 yellow-orange
- 렌더 루프: background mesh(지면+선형) + 피처별 독립 draw call 분리
- SceneParams: GirderSectionType (PscI / SteelBox), show_alignment
- egui: 단면형식 ComboBox, 선형표시 checkbox
- SteelBox 단면 지원 (span 비례 자동 치수)
- build_background_scene(): 지면+선형만 반환

Sprint 12 (Project save/load):
- project_file.rs: ProjectFile struct, to_params/from_params, save/load JSON
- egui: 💾 저장 / 📂 불러오기 버튼
- projects/ 폴더 자동 생성

Sprint 13 (Tauri app skeleton):
- crates/app/: Cargo.toml + main.rs (Tauri v2 통합 scaffold)
- 기동 시 PureRustKernel 동작 검증
- Tauri setup checklist 주석으로 문서화
- workspace에 cimery-app 추가

cargo check --workspace 통과

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cimery/crates/app/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name    = "cimery-app"
+version.workspace = true
+edition.workspace = true
+description = "cimery desktop application (Tauri v2 + Leptos UI)"
+
+[features]
+# Geometry backends
+occt = ["cimery-kernel/occt"]
+
+[dependencies]
+cimery-core        = { workspace = true }
+cimery-ir          = { workspace = true }
+cimery-dsl         = { workspace = true }
+cimery-kernel      = { workspace = true }
+cimery-incremental = { workspace = true }
+cimery-evaluator   = { workspace = true }
+cimery-usd         = { workspace = true }
+
+serde      = { workspace = true }
+serde_json = { workspace = true }
+log        = { workspace = true }
+env_logger = { workspace = true }
+
+# Tauri v2 (ADR-001: desktop packaging)
+# Uncomment when setting up Tauri project:
+# tauri = { version = "2", features = ["devtools"] }

cimery/crates/app/src/main.rs

@@ -0,0 +1,61 @@
+//! cimery-app — Tauri v2 desktop application skeleton.
+//!
+//! ADR-001: Tauri v2 (desktop) + PWA (web) dual-target.
+//! ADR-003 A3: Gitea CI → GitHub Actions for Win/macOS release builds.
+//!
+//! # Sprint 13 (this file): application shell scaffold
+//! - Tauri integration commented out (requires `tauri init` + frontend setup)
+//! - Core domain logic wired and accessible
+//!
+//! # Sprint 14: Leptos UI frontend
+//! - Leptos component tree for ribbon/panel/viewport layout
+//! - wgpu viewport embedded as a <canvas> element
+//! - Property panel connected to cimery-dsl builders
+//!
+//! # Tauri setup checklist (run once):
+//! 1. `cargo tauri init` in this directory
+//! 2. Edit `tauri.conf.json`: app name, window size, icons
+//! 3. Implement Tauri commands (IPC bridge) in `src/commands.rs`
+//! 4. Set up Leptos frontend in `src/ui/`
+
+use cimery_dsl::Girder;
+use cimery_core::UnitExt;
+use cimery_kernel::{GeomKernel, PureRustKernel};
+
+fn main() {
+    env_logger::init();
+
+    // ── Quick sanity check: build a test girder ──────────────────────────────
+    let girder = Girder::builder()
+        .station_start(0.0.m())
+        .station_end(40.0.m())
+        .section_psc_i_default()
+        .count(5)
+        .spacing(2500.0.mm())
+        .build()
+        .expect("valid girder");
+
+    let mesh = PureRustKernel.girder_mesh(&girder.ir)
+        .expect("girder mesh");
+
+    log::info!(
+        "cimery-app startup OK — test girder: span={:.0}m, triangles={}",
+        girder.ir.span_m(), mesh.triangle_count()
+    );
+
+    // ── Tauri entry point (activate when Tauri is set up) ──────────────────
+    // Uncomment after `cargo tauri init`:
+    //
+    // tauri::Builder::default()
+    //     .invoke_handler(tauri::generate_handler![
+    //         commands::get_scene_params,
+    //         commands::set_scene_params,
+    //         commands::save_project,
+    //         commands::load_project,
+    //     ])
+    //     .run(tauri::generate_context!())
+    //     .expect("Tauri runtime error");
+
+    println!("cimery-app v{}", env!("CARGO_PKG_VERSION"));
+    println!("Tauri integration: pending (Sprint 14 — run `cargo tauri init`)");
+}