fix: strip Sphinx pilcrow artifacts from extracted text

Sphinx generates headerlink anchors (the paragraph symbol ¶) next to
each heading. These appear as ¶ in the output due to a UTF-8/Latin-1
decode mismatch in BeautifulSoup. Fix by removing .headerlink elements
in NOISE_SELECTORS and stripping any residual ¶/¶ in clean_text().

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scraper/scraper.py

@@ -78,6 +78,7 @@ NOISE_SELECTORS = [
     ".rst-footer-buttons", "#edit-on-github",
     "[role='navigation']", ".breadcrumbs",
     ".sidebar", ".sphinxsidebar",
+    ".headerlink",   # Sphinx ¶ permalink anchors
     "script", "style",
 ]
 
@@ -248,6 +249,8 @@ def clean_text(soup: BeautifulSoup) -> tuple:
 
     raw = "\n".join(lines)
     clean = re.sub(r"\n{3,}", "\n\n", raw).strip()
+    # Strip residual Sphinx pilcrow characters (¶ and its mis-decoded form ¶)
+    clean = re.sub(r"¶|¶", "", clean).strip()
     return clean, headings