[bug] MATH grader: \displaystyle and \tag{…} survive normalize — break exact match

[marktech0813]

Problem

Presentation-only tokens left in the normalized string:

normalize_math_answer(r"\displaystyle\frac{1}{2}")  # contains "displaystyle"
score_text("math500", r"\boxed{\displaystyle\frac{1}{2}}", "1/2")  # 0.0
normalize_math_answer(r"5\tag{1}")  # "5\tag{1}"
score_text("math500", r"\boxed{5\tag{1}}", "5")  # 0.0

Expected

\displaystyle deleted; \tag{…} peeled; answers grade equal to plain gold.

Environment

• origin/main

[github-actions]

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