Final review polish:
- Add an inline comment on the claude-opus-4-7-thinking registry entry
explaining it is a pricing-only id kept for historical analytics data
(no catalog model after Opus 4.7 moved to adaptive thinking levels),
and why it carries no fast tier.
- Add a test asserting applyServiceTier preserves the serviceTiers map on
its result, guarding against a future simplification dropping it.
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Sergey Galuza
1fc595f10c