DOCX: internal TOC / cross-reference hyperlinks emit dead [text](#_Toc…) anchors

What happens

DOCX internal hyperlinks — Table-of-Contents entries and cross-references — are converted to Markdown links that point at the Word bookmark anchor, e.g. [Executive Summary](#_Toc12345). These #_Toc… / #_… anchors don't resolve in the standalone Markdown, so a real document's TOC becomes a block of dead links — noise for text/LLM consumption.

Minimal repro

markitdown[docx] 0.1.6, Python 3.12:

import tempfile, os
from docx import Document
from docx.oxml.ns import qn
from docx.oxml import OxmlElement

doc = Document()
p = doc.add_paragraph()
hl = OxmlElement('w:hyperlink'); hl.set(qn('w:anchor'), '_Toc12345')   # internal anchor (a TOC entry)
r = OxmlElement('w:r'); t = OxmlElement('w:t'); t.text = "Executive Summary"
r.append(t); hl.append(r); p._p.append(hl)
path = os.path.join(tempfile.gettempdir(), "repro.docx"); doc.save(path)

from markitdown import MarkItDown
print(MarkItDown().convert(path).text_content)

Actual output

[Executive Summary](#_Toc12345)

Expected / suggestion

For internal-only anchors (a w:anchor with no external target), render the link text as plain text (or drop the dead #_anchor), so a TOC / cross-reference becomes readable text rather than dead links.

Start by running the minimal DOCX reproduction with markitdown[docx] and inspect the DOCX hyperlink conversion path. Verify that internal-only w:anchor links such as _Toc12345 are rendered as readable plain text, while the output no longer contains dead #_Toc… anchors.