docs(sdlc): address 23/09 review feedback

Trace every CR to a test case or delivered document, drop the draft FR/NFR remark column, record lessons learned, replace the three change reports with a change-control register, add high-level diagrams and wireframes to the design, plan verification rounds with dates and hours, and base the validation result on the Customer Requirements.

scripts/sdlc-delivery/convert-to-docx.py

@@ -188,15 +188,19 @@ LOGO_MIN_PX = 100
 def strip_logo_images(document):
     """Drop the letterhead logo left loose in the body.
 
-    The work products carry no figures of their own, but the converter draws
-    each bullet as a small image, so only the logo is removed - anything that
-    size would be furniture, anything smaller is a list marker.
+    The converter draws each bullet as a small image, so only the logo is
+    removed: it is square and at least LOGO_MIN_PX, whereas anything smaller is
+    a list marker. The Software Design figures are wider than they are tall,
+    so they are kept.
     """
+    def is_logo(image):
+        width, height = image.px_width, image.px_height
+        return max(width, height) >= LOGO_MIN_PX and 0.8 <= width / max(height, 1) <= 1.25
+
     logos = {
         relationship_id
         for relationship_id, part in document.part.related_parts.items()
-        if getattr(part, 'image', None) is not None
-        and max(part.image.px_width, part.image.px_height) >= LOGO_MIN_PX
+        if getattr(part, 'image', None) is not None and is_logo(part.image)
     }
 
     removed = 0