feat(branding): embed slohmaier logo on cover + running page header

- branding/: light + dark logo SVG sources and 1600x452 PNG renders
- build_word_template.py: replace [LOGO] placeholder with add_picture
  on cover (7 cm wide, right-aligned) plus a 2.8 cm logo as a second
  paragraph in the running page header so derived pandoc-generated
  templates inherit the branding on every page

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

tools/build_word_template.py

@@ -246,6 +246,11 @@ def build_header_footer(doc, doc_id_placeholder="<DOC-ID>", classification="CONF
     r3 = header_para.add_run(doc_id_placeholder)
     r3.font.size = Pt(9)
     r3.font.color.rgb = RGBColor(0x59, 0x59, 0x59)
+    if LOGO_PATH.exists():
+        logo_para = header.add_paragraph()
+        logo_para.alignment = WD_ALIGN_PARAGRAPH.RIGHT
+        logo_run = logo_para.add_run()
+        logo_run.add_picture(str(LOGO_PATH), width=Cm(2.8))
 
     # --- Default footer (skipped on cover page) ---
     footer = section.footer
@@ -283,13 +288,21 @@ def build_header_footer(doc, doc_id_placeholder="<DOC-ID>", classification="CONF
 # Content
 # ---------------------------------------------------------------------------
 
+REPO_ROOT = Path(__file__).resolve().parent.parent
+LOGO_PATH = REPO_ROOT / "branding" / "logo-doc-light.png"
+
+
 def add_cover_page(doc):
-    # Top logo placeholder
+    # Top logo (right-aligned, ~7 cm wide)
     p = doc.add_paragraph()
     p.alignment = WD_ALIGN_PARAGRAPH.RIGHT
-    r = p.add_run("[LOGO]")
-    r.font.size = Pt(10)
-    r.font.color.rgb = RGBColor(0x80, 0x80, 0x80)
+    if LOGO_PATH.exists():
+        run = p.add_run()
+        run.add_picture(str(LOGO_PATH), width=Cm(7))
+    else:
+        r = p.add_run("[LOGO]")
+        r.font.size = Pt(10)
+        r.font.color.rgb = RGBColor(0x80, 0x80, 0x80)
 
     # Vertical space
     for _ in range(8):