Add Chris custom MiniMax H3 extender workflow

README.md

@@ -10,6 +10,7 @@ Model-organized workflow library for local ComfyUI use.
 - `models/flux2klein/` - FLUX.2-klein workflows and notes
 - `models/ideogram/` - Ideogram workflows and text-placement notes
 - `models/minimax/` - MiniMax workflows and notes
+- `custom/` - personal or in-house working workflows kept separate from imports and masters
 - `optimized/` - maintained category masters built from collected workflows
 - `models/_incoming/` - temporary holding area when a workflow is still being classified
 - `templates/workflow-template/` - starter folder for new workflow imports
@@ -34,6 +35,10 @@ Optimized workflows live under:
 
 `optimized/<category>/<family>-master/`
 
+Personal or project-specific working workflows live under:
+
+`custom/<owner>/<workflow-slug>/`
+
 ## Conventions
 
 - Organize primarily by model family.