A `class Foo;` forward declaration parses as a bodiless class_specifier.
extractStruct (#831) and extractEnum already skip their bodiless forms,
but extractClass did not — so every forward decl across dozens of headers
minted a phantom bodiless `class` node that competed with, and could be
picked as the blast-radius representative over, the single real definition.
Add an opt-in `skipBodilessClass` extractor flag (set only on cppExtractor)
and skip a bodiless class node when it's set, mirroring the struct/enum
skip. The flag keeps this C/C++-scoped: languages where a bodiless class is
a complete definition (Kotlin `class Empty`, Scala `case object`/`trait`)
leave it unset and are unaffected. The body is now resolved once at the top
of extractClass and reused for the member walk.
Regression tests cover the collapse to a single definition, elaborated-type
references creating no phantom, and Kotlin/Scala staying indexed.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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