chore(quick-dev): drop the render.py success stderr line

The "rendered N files" progress line was pure diagnostic noise. The shim
already tells the LLM to ignore stderr and follow the stdout instruction, so
on success render.py now prints only the "read and follow ..." line.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/bmm-skills/4-implementation/bmad-quick-dev/render.py

@@ -270,7 +270,6 @@ def main():
         if fname.endswith(".md"):
             os.remove(posixpath.join(out_dir, fname))
 
-    count = 0
     for fname in sorted(os.listdir(script_dir)):
         if not fname.endswith(".md") or fname == "SKILL.md":
             continue
@@ -280,9 +279,7 @@ def main():
             content = fh.read()
         with open(dst, "w", encoding="utf-8", newline="") as fh:
             fh.write(render_workflow(render_template(content, vars_), workflow))
-        count += 1
 
-    print(f"render.py: rendered {count} files -> {out_dir}", file=sys.stderr)
     workflow_md = posixpath.join(out_dir, "workflow.md")
     print(f"read and follow {workflow_md}")