feat: add arty notes command with markdown rendering support

Adds 'arty notes' command to display project notes from arty.yml with beautiful markdown rendering. Features include:

- Reads 'notes' field from arty.yml
- Supports full markdown syntax (headers, bold, italic, code blocks, links, lists)
- Smart rendering fallbacks: glow → mdcat → python3 → plain text
- Beautiful terminal output with colors and formatting
- ANSI escape codes for syntax highlighting
- Horizontal separators for code blocks

Also renamed arty.sh to artifact_git_download.sh for better clarity.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

comfyui_models.example.yaml

@@ -1,80 +0,0 @@
-# ComfyUI Models Configuration Example
-#
-# This file defines which models to download from HuggingFace
-# and where to symlink them in your ComfyUI installation.
-#
-# Model types correspond to ComfyUI subdirectories:
-#   - checkpoints: Stable Diffusion checkpoints
-#   - vae: VAE models
-#   - loras: LoRA models
-#   - controlnet: ControlNet models
-#   - clip: CLIP models
-#   - clip_vision: CLIP Vision models
-#   - upscale_models: Upscaler models
-#   - embeddings: Textual inversion embeddings
-#   - hypernetworks: Hypernetwork models
-#   - style_models: Style transfer models
-
-settings:
-  cache_dir: ~/.cache/huggingface
-  parallel_downloads: 1
-
-model_categories:
-  # Stable Diffusion Checkpoints
-  checkpoints:
-    - repo_id: runwayml/stable-diffusion-v1-5
-      description: Stable Diffusion v1.5
-      size_gb: 4
-      essential: true
-      type: checkpoints
-      filename: ""  # Empty means all model files
-
-    - repo_id: stabilityai/stable-diffusion-xl-base-1.0
-      description: SDXL Base 1.0
-      size_gb: 7
-      essential: true
-      type: checkpoints
-      filename: ""
-
-  # VAE Models
-  vae:
-    - repo_id: stabilityai/sd-vae-ft-mse-original
-      description: SD VAE ft MSE
-      size_gb: 0.3
-      essential: true
-      type: vae
-      filename: ""
-
-  # LoRA Models
-  loras:
-    - repo_id: latent-consistency/lcm-lora-sdv1-5
-      description: LCM LoRA for SD v1.5
-      size_gb: 0.1
-      essential: false
-      type: loras
-      filename: ""
-
-  # ControlNet Models
-  controlnet:
-    - repo_id: lllyasviel/control_v11p_sd15_canny
-      description: ControlNet Canny
-      size_gb: 1.4
-      essential: false
-      type: controlnet
-      filename: ""
-
-    - repo_id: lllyasviel/control_v11p_sd15_openpose
-      description: ControlNet OpenPose
-      size_gb: 1.4
-      essential: false
-      type: controlnet
-      filename: ""
-
-  # Upscale Models
-  upscale_models:
-    - repo_id: ai-forever/Real-ESRGAN
-      description: Real-ESRGAN x4
-      size_gb: 0.1
-      essential: false
-      type: upscale_models
-      filename: "RealESRGAN_x4plus.pth"