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Answer cascade false from the cascade reader for a version that does not cascade (#3026)

The cascade reader and the compiled API each resolved the setting. The
compiled API fell back to the cascade: option of version, the reader went
straight to true, so with `version 'v1', cascade: false` API.cascade
answered true for an API that did not cascade.

The reader now holds the one resolution, and the compiled API reads it
there. The two specs meant to pin that a request does not cascade looked
for 'X-Cascade' among the header keys, which Rack 3 lowercases, so they
passed whatever the response carried; they now read the header.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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