more docs migrations

docs/modules/bmm-bmad-method/images/README.md

@@ -0,0 +1,37 @@
+# Workflow Diagram Maintenance
+
+## Regenerating SVG from Excalidraw
+
+When you edit `workflow-method-greenfield.excalidraw`, regenerate the SVG:
+
+1. Open <https://excalidraw.com/>
+2. Load the `.excalidraw` file
+3. Click menu (☰) → Export image → SVG
+4. **Set "Scale" to 1x** (default is 2x)
+5. Click "Export"
+6. Save as `workflow-method-greenfield.svg`
+7. **Validate the changes** (see below)
+8. Commit both files together
+
+**Important:**
+
+- Always use **1x scale** to maintain consistent dimensions
+- Automated export tools (`excalidraw-to-svg`) are broken - use manual export only
+
+## Visual Validation
+
+After regenerating the SVG, validate that it renders correctly:
+
+```bash
+./tools/validate-svg-changes.sh path/to/workflow-method-greenfield.svg
+```
+
+This script:
+
+- Checks for required dependencies (Playwright, ImageMagick)
+- Installs Playwright locally if needed (no package.json pollution)
+- Renders old vs new SVG using browser-accurate rendering
+- Compares pixel-by-pixel and generates a diff image
+- Outputs a prompt for AI visual analysis (paste into Gemini/Claude)
+
+**Threshold**: <0.01% difference is acceptable (anti-aliasing variations)