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test(asic): extract nonce dedup ring buffer (TA-234) (#196)

ninth target of the TA-234 seam-for-testability pass. asic_task's
nonce dedup ring (16-deep, keyed on job_id+nonce+ver_bits, evicts
oldest on wraparound) was inline with two file-scope statics and
two anonymous struct types. extract to asic_nonce_dedup.{c,h}:

  asic_nonce_dedup_reset(d)              — clean-job invalidate
  asic_nonce_dedup_check_and_insert(d, job, nonce, ver) → bool dup

asic_task.c uses the helper at the share-found path. ~8 host tests
cover fresh state, immediate redundancy, distinct keys, ring
wraparound eviction, reset, and cyclic next_idx advancement.

no behavior change. dedup struct now stores 16-entry ring + uint8_t
write index (was an anonymous struct array with a separate static
index counter; functionally identical).

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

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