Phase 0 of expert feedback (#1~#11): infrastructure + design + 1차 fixes

Implementations (즉시 동작):
- #1 crash logging: harness/crash_logger.py (sys.excepthook + threading +
  faulthandler, 회전 파일 logs/scanvas.log). main 진입점 통합.
- #2 smooth curves (1차): gate_3d_builder ogee profile를 arc-length parametric
  CubicSpline로 4× densify (8pt→32pt, 36→132 cells, 60 FPS 안전).
- #3 TIN colormap: matplotlib "terrain"의 파란색 범위 제거 → 짙은갈색→황토→
  모래→능선 LinearSegmentedColormap. 9 사이트 교체. 회귀 테스트 추가.
- #5 uv: pyproject.toml + UV_GUIDE.md. base/[py313]/[dev]/[build] extras + hatchling.
- #6,#7,#8 dev cycle infra: .pre-commit-config.yaml (ruff+secrets+위생),
  .gitea/workflows/ci.yml (Py3.11+3.13 matrix), tests/test_regressions.py
  (18 회귀 테스트, iter=1~7 fix 박제), CONTRIBUTING.md (Red→Green 알고리즘).

Design docs (다음 세션 마이그레이션 청사진):
- #4 UI/UX 전면 수정: UI_REDESIGN_PLAN.md (12 popup→1 inspector, vtkTkRenderWidget
  embedding 게이트, 4 phase × 7 sessions).
- #10 Core/Plugin: ARCHITECTURE_PLAN.md (Core 14 / Plugin 7 구조물 + 2 렌더 + 1 QA,
  STRUCTURE_REGISTRY 확장, manifest 기반 디스커버리).
- #11 perf hotspots: PERFORMANCE_BASELINE.md (19 핫스팟, P1: 타일 직렬DL 5~30s,
  캡처 직렬 4.5~15s, numpy 벡터화 가능 Python loops, 텍스처 4회 반복read).

Behavior preservation: ruff 0 errors, pytest 17 passed/1 skipped(bpy),
import 33/33 OK on Py3.13.13.

Item #2 P2/P3 곡선, #4 UI 마이그레이션, #10 Phase 1 추출, #11 P1 최적화는 차기 세션.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -0,0 +1,86 @@
+# Gitea Actions — Red → Green 게이트.
+# 피드백 #6: "Git을 이용해서 개발 cycle (Red→Green)이 완료되면 Git(s-canvas)에 자동
+#             업로드 프로세스 구축 (ruff, pytest 등을 적극 활용)"
+#
+# 트리거: push 모든 브랜치, PR. main 브랜치는 추가 보호.
+#
+# Stage 구성:
+#   1. ruff (린트) — 30초 미만
+#   2. py_compile (전체 syntax) — 10초 미만
+#   3. pytest (회귀 + 빠른 단위) — 1~2분
+#   4. (선택) coverage report
+#
+# 모두 통과 = Green. main 브랜치는 Green 통과 시에만 push 허용 (Gitea repo 설정).
+
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint-and-test:
+    name: Ruff + Test (Py3.11 + Py3.13)
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.13"]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup uv (fast Python pkg manager)
+        uses: astral-sh/setup-uv@v3
+        with:
+          enable-cache: true
+
+      - name: Setup Python ${{ matrix.python-version }}
+        run: uv python install ${{ matrix.python-version }}
+
+      - name: Install deps
+        run: |
+          uv venv .venv --python ${{ matrix.python-version }}
+          uv pip install --python .venv -e ".[dev]"
+          # Py3.13은 호환 핀 별도
+          if [ "${{ matrix.python-version }}" = "3.13" ]; then
+            uv pip install --python .venv -e ".[py313,dev]"
+          fi
+
+      - name: Ruff lint
+        run: |
+          source .venv/bin/activate
+          ruff check --output-format=github
+
+      - name: py_compile (전체 .py)
+        run: |
+          source .venv/bin/activate
+          python -c "
+          import py_compile, pathlib, sys
+          errs = []
+          for p in sorted(pathlib.Path('.').rglob('*.py')):
+              if any(s in str(p) for s in ('venv', '_unused', '__pycache__', '.bak')):
+                  continue
+              try:
+                  py_compile.compile(str(p), doraise=True)
+              except py_compile.PyCompileError as e:
+                  errs.append((p, str(e)[:200]))
+          for p, m in errs:
+              print(f'::error file={p}::{m}')
+          sys.exit(1 if errs else 0)
+          "
+
+      - name: pytest (회귀)
+        run: |
+          source .venv/bin/activate
+          pytest -ra --tb=short -m "not slow and not integration"
+
+      - name: pytest (slow + integration, allow failure)
+        if: ${{ matrix.python-version == '3.13' }}
+        continue-on-error: true
+        run: |
+          source .venv/bin/activate
+          pytest -ra --tb=short -m "slow or integration"