Build overbar and set-complement notation structurally

[abcdsen-create]

Priority: High

Description

Document
that a precomposed accented letter such as Ā must not be used to imitate a
mathematical overbar. Use <mover> for the visible notation. When a
semantic complement reading is required and supported, add
intent="complement(...)" and a matching arg value.

Recommended markup

<mrow
intent="complement($A)">

<mover><mi arg="A">A</mi><mo>‾</mo></mover>

</mrow>

Acceptance criteria

• Guidance prohibits lookalike precomposed accented characters.
• Structural <mover> markup is demonstrated.
• The generic expected reading (“A bar”) and semantic expected reading (“complement of A”) are distinguished.
• Behavior is tested in every supported language and reading system.

Reading-pipeline dependency

Confirm
that complement is implemented and localized in the speech-rule engine. If a
correctly authored expression still reads only as “A bar,” track the missing
intent rule or translation as a separate software issue.