chore: build_readme_pdf.py outputs to ~/Desktop, not the repo

The PDF is a sharable artifact (email / Slack / AirDrop), not a repo asset.
Repo holds README.md (the source of truth, present on HF Space + GitHub);
the PDF gets regenerated to the Desktop where it's easy to grab and share.

Output path: ~/Desktop/Insurance-Sales-Bot-README.pdf

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

tools/build_readme_pdf.py

@@ -20,7 +20,10 @@ from markdown_pdf import MarkdownPdf, Section
 
 ROOT = Path(__file__).resolve().parent.parent
 README_PATH = ROOT / "README.md"
-OUT_PATH = ROOT / "README.pdf"
+# PDF is a sharable artifact, not a repo asset. Drop it on the Desktop so
+# the user can email / Slack / AirDrop it without digging into ~/Developer/.
+# HF Space also rejects binaries in the Space repo (Xet/LFS required).
+OUT_PATH = Path.home() / "Desktop" / "Insurance-Sales-Bot-README.pdf"
 
 
 def strip_yaml_frontmatter(text: str) -> str: