fix(php-transformer): stop WordPress body classes inheriting source frames

[chubes4]

Problem

body_class() stamps template names onto <body>: page, home, search, single, and friends. A source stylesheet that centers an element of the same name therefore styles the document body too.

On the academic CV fixture the author rule is:

.page { max-width: var(--measure); margin: 0 auto; padding: 5rem var(--gutter-x) 6rem }

WordPress renders <body class="home ... page page-id-5"> and the source <main class="page">, so the frame is paid twice:

	source	imported
h1 width	652px	584px
dd width	469px	401px
page height @1280	8673px	9438px

Text content is identical; the extra 765px is line rewrapping inside a column that lost one horizontal gutter pair.

Fix

Emit a bounded compatibility rule beside the existing body-owned rules in WordPressCompatCss. When a source stylesheet gives a bare reserved template class frame geometry, reset only those properties on body:

body.page { max-width:none!important;width:auto!important;padding-inline:0!important;margin-inline:0!important }

The element keeps its own rule. Paint is untouched. Unreserved classes, element-qualified selectors (main.page), descendant selectors, and non-frame declarations are all left alone.

Validation

• php php-transformer/tests/unit/wordpress-body-class-collision.php (13 assertions, registered in composer test:unit)
• php php-transformer/tests/unit/admin-bar-accommodation.php, author-cascade-layer-order.php, artifact-author-stylesheet-projection.php
• composer validate --strict

AI assistance

• Model: grok-4.6
• Tool: OpenCode
• Used for: Measured the source/import geometry drift on a Studio import, traced it to the duplicated .page frame, implemented the compat rule, and wrote the coverage.