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refactor(mining): factor S3 hot loop into shared inline kernel + regression test (#348)

The S3/S2/C3 HW SHA hot loop was duplicated between hw_hash_nonce (backend
method) and an inline copy in mine_nonce_range, kept consistent only by
KEEP IN SYNC banners. Extract hw_hot_loop_kernel as static inline
__attribute__((always_inline)); both sites call it directly. The dispatch
copy keeps its function-pointer signature for the backend vtable; the
inline branch in mine_nonce_range still skips the function-pointer call
because it invokes the kernel directly. No more drift surface.

Also adds host-side regression tests for mine_nonce_range so any breakage
of the surrounding loop wiring (target/diff/result handling) is caught
on the SW path.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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