Fix regex word-boundary in anchor tag detection

[Copilot]

r"<a\\b" in a raw string produces the regex pattern <a\\b, which matches a literal backslash-b — never present in real HTML. The guard was always false, so tag2html_link re-wrapped already-linked HTML, producing nested <a> elements.

Change

• tools/create_params.py:1260 — fix double-escaped backslash to proper word-boundary assertion:

# Before (matches literal '\b', never true for real HTML)
if re.search(r"<a\\b", html):

# After (matches word boundary, correctly detects existing <a ...> tags)
if re.search(r"<a\b", html):

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