Freeze pre-v2 theme goldens and add generator version (#241)
* Freeze pre-v2 theme goldens and add generator version
Snapshot the tactile and paper theme CSS as permanent pre-v2 compatibility
fixtures before the v2 generator rewrite, and add THEME_GENERATOR_VERSION
threaded into the stylesheet header. Token values stay byte-identical; only
the header line is excluded from the golden comparison.
Part of #231 (#232).
* Drop generator versioning from theme build
Revert the stylesheet header to its original string per PR review;
versioning is deferred until v1. With the header unchanged, the pre-v2
compatibility goldens now match emitted output verbatim, so the golden
tests compare full output directly and the header-diff test is removed.
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