fix(release): remove hardcoded 'Version 2.0.0' from demo PDF (QA-caught)

Phase 3 follow-up: QA reviewer caught a stale version label that

Phase 1 missed. generate_demo_guide.py:73 hardcoded 'Version 2.0.0'

on the PDF title page. Phase 1 only fixed line 290 (prose body).

Fix: drop the version-stamp line entirely. Hardcoded version strings

are exactly the doc-drift anti-pattern per CLAUDE.md ("Never copy

a fact that lives in code"). The brand line 'Security Engineering

Team' stays as title-page attribution.

PDF regenerated deterministically: 10744B -> 10716B (28B smaller).

Caught by qa-reviewer SubAgent dispatched on commit 5eb91f2.

doc-drift: OK (32 docs against build 660)

Author: RelativisticJet

demo/Demo_Guide.pdf

@@ -70,7 +70,6 @@ def title_page(self):
         self.ln(40)
         self.set_font("Helvetica", "", 10)
         self.cell(0, 8, "Security Engineering Team", align="C", new_x="LMARGIN", new_y="NEXT")
-        self.cell(0, 8, "Version 2.0.0", align="C", new_x="LMARGIN", new_y="NEXT")
 
     def section(self, number, title):
         self._check_space(20)