dangernoodle-io / TaipanMiner / 25090224063

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fix(asic): right-size job table from 128 to 16 slots (TA-297) (#255)

- add ASIC_JOB_TABLE_SIZE=16 constant to asic_proto.h, decoupled from
  wire-protocol modulus ASIC_JOB_ID_MOD=128 (unchanged)
- shrink s_job_table from 128 to 16 entries, reclaiming ~24.5 KB BSS
- add parallel s_job_id_seen[] and s_job_gen[] arrays (16 bytes each)
  for slot-identity and generation tracking
- replace raw array-index lookup with job_slot mapping via
  asic_job_slot() (real_job_id % ASIC_JOB_TABLE_SIZE)
- replace bounds-only receive guard with identity guard: drop nonces
  whose real_job_id does not match s_job_id_seen[slot], preventing
  stale/recycled-slot nonces from resolving to the wrong work
- expose asic_job_slot() and asic_job_slot_stale() as public inlines
  in asic_proto.h for host-test coverage
- add test/test_host/test_asic_job_table.c covering slot mapping,
  stride-24 ID distribution, stale rejection, and empty-slot guard

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