Add custom nodes, Civitai loras (LFS), and vast.ai setup script

Includes 30 custom nodes committed directly, 7 Civitai-exclusive
loras stored via Git LFS, and a setup script that installs all
dependencies and downloads HuggingFace-hosted models on vast.ai.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom_nodes/comfyui_ultimatesdupscale/test/README.md

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+# Running Tests
+
+This directory contains tests for ComfyUI_UltimateSDUpscale.
+
+## Prerequisites
+
+- These tests assume that ComfyUI is installed using a virtual environment
+- Activate the ComfyUI virtual environment before running tests
+- The checkpoint `v1-5-pruned-emaonly-fp16.safetensors` is available
+- The upscale model `4x-UltraSharp.pth` is available
+
+## Running Tests
+
+### Using the convenience scripts (works from repo root or test directory):
+
+**Linux/Mac (Bash):**
+```bash
+./test/run_tests.sh       # From repo root
+./run_tests.sh            # From test directory
+```
+run_tests.sh will forward all arguments into pytest.
+
+### Using pytest directly (must be in test directory):
+
+```bash
+cd test
+pytest          # Run all tests
+pytest -v       # Verbose
+```
+
+### Common pytest options:
+
+- `-v` - Verbose output
+- `-s` - Show print statements
+- `--log-cli-level=INFO` - Show info-level logs
+- `-k PATTERN` - Run tests matching pattern
+- `--lf` - Run last failed tests
+
+## Test Structure
+
+- `conftest.py` - Pytest configuration, fixtures, and path setup
+- `sample_images/` - Generated test images for visual inspection
+- `test_images/` - Reference images used as inputs or expected outputs
+
+## Troubleshooting
+
+If you encounter import errors:
+1. Make sure you're running from the `test/` directory
+2. Verify the virtual environment is activated