`force_operation_parentheses` adds no parentheses inside an already-parenthesized expression

[livingstaccato]

Summary

ExprTermRule.serialize sets inside_parentheses to
self.parentheses or context.inside_parentheses
(hcl2/rules/expressions.py:103 at v8.1.3), so the flag stays set for the
whole subtree. _wrap_into_parentheses (:37) reads it at :47 as "my
immediate parent already wrapped me" and declines to wrap. Anything under a parenthesized
ancestor therefore loses the parentheses the option exists to add.

Reproduction

options = SerializationOptions(force_operation_parentheses=True)

hcl2.loads("a = b + c * d\n",   serialization_options=options)["a"]  # '${b + (c * d)}'
hcl2.loads("a = (b + c * d)\n", serialization_options=options)["a"]  # '${(b + c * d)}'

The second should contain (c * d) as the first does.

Suggested shape of the fix

Drop or context.inside_parentheses. Each inner ExprTermRule re-sets the
flag from its own self.parentheses, so ((b + c) * d) still comes out right.

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This issue, and the investigation behind it, were produced by an AI assistant (Claude) working on behalf of the author. Please review with that provenance in mind.