Add artifact flow arrows and regeneration reference file

Co-authored-by: leofang <5534781+leofang@users.noreply.github.com>

Author: Copilot

ci/.ci-pipeline-regen.txt

@@ -0,0 +1,69 @@
+CUDA Python CI Pipeline SVG Regeneration Instructions
+====================================================
+
+This file contains the prompt and requirements for regenerating ci-pipeline.svg with the same styling and content.
+
+## Styling Requirements
+- Hand-drawn Excalidraw-style design with rough, sketchy borders
+- Comic Sans MS font family for all text
+- Imperfect lines and curves that mimic hand-drawn aesthetics
+- Canvas size: 900x800 pixels
+- Color scheme:
+  - Trigger Events: #e8f4fd background, #2196F3 border, #1976D2 text
+  - Build Stage: #f3e5f5 background, #9C27B0 border, #7B1FA2 text
+  - Artifact Storage: #fff3e0 background, #FF9800 border, #F57C00 text
+  - Test Stage: #e8f5e8 background, #4CAF50 border, #388E3C text
+  - Release Pipeline: #ffebee background, #f44336 border, #D32F2F text
+
+## Content Structure
+1. **Title**: "CUDA Python CI Pipeline Flow"
+
+2. **Trigger Events** (top blue box):
+   - Push to main branch
+   - Pull request
+   - Push to pull-request/* branches
+   - Manual workflow dispatch
+
+3. **Build Stage** (purple box):
+   - Three platform boxes: linux-64 (Self-hosted), linux-aarch64 (Self-hosted), win-64 (GitHub-hosted)
+   - Details: Python versions 3.9-3.13, CUDA 13.0.0 (build-time)
+   - Components: cuda-core, cuda-bindings, cuda-pathfinder, cuda-python
+
+4. **Artifact Storage** (orange box):
+   - GitHub Artifacts box: Wheel files (.whl), Test artifacts, Documentation (30-day retention)
+   - GitHub Cache box: Mini CTK cache
+
+5. **Test Stage** (green box):
+   - Three platform boxes: linux-64 (Self-hosted), linux-aarch64 (Self-hosted), win-64 (GitHub-hosted)
+   - Details: Download wheels from artifacts, Test against multiple CUDA runtime versions, Run Python unit tests, Cython tests, examples
+   - Artifact Flows (in red text):
+     • cuda-pathfinder: main → backport
+     • cuda-bindings: backport → main
+
+6. **Release Pipeline** (red box):
+   - Three sequential boxes: Validation → Publishing → Documentation
+   - Validation: Artifact integrity, Git tag verification
+   - Publishing: PyPI/TestPyPI, Component or all releases
+   - Documentation: GitHub Pages, Release notes
+   - Details: Manual workflow dispatch with run ID, Supports individual component or full releases
+
+## Arrow Requirements
+- Main flow arrows: Trigger → Build → Artifact → Test → Release
+- Additional artifact flow arrows (dashed, orange #FF9800):
+  - From GitHub Cache (mini CTK) back to Build Stage with "mini CTK reuse" label
+  - From GitHub Artifacts (wheels) to Release Pipeline with "wheel fetch" label
+- Arrow marker definition with hand-drawn style
+- Use stroke-dasharray="5,3" for artifact flow arrows
+
+## Key Features
+- All boxes use rough, hand-drawn paths (not perfect rectangles)
+- Text should be properly sized and positioned within boxes
+- Platform boxes within each stage should be clearly separated
+- Maintain consistent spacing and alignment
+- Use appropriate font sizes: 16pt title, 14pt stage headers, 12pt platform names, 11pt details, 9-10pt smaller text
+
+## Text Positioning
+- Use text-anchor="middle" for centered headers
+- Use text-anchor="start" for left-aligned bullet points
+- Ensure all text fits within their enclosing boxes
+- Use transforms for angled text labels on artifact flow arrows