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test(asic): extract telemetry drop-detection state (TA-234) (#192)

fifth target of the TA-234 seam-for-testability pass. asic_task's
TA-223 drop-detection logic (sanity cap + per-(chip,metric) 30s warn
cooldown + drop counter) was inline in three near-identical metric
update branches (total/error/domain). extract the gating decision to
asic_drop_detect.{c,h}: pure function

  asic_drop_detect_evaluate(ghs, sanity_max, now, last_warn, cooldown)
  → { accept, should_warn, new_last_warn_us }

asic_task.c routes all 3 sites through the helper. behavior unchanged.

7 host tests cover:
- accept below sanity
- reject at-or-above sanity (strict less-than semantics)
- first warn fires immediately (last_warn=0)
- cooldown suppresses repeat warns
- warn fires once cooldown elapses
- domain (smaller) cap independent of chip cap
- zero-cooldown edge case

unblocks the TA-227 polish (counter-wrap detection + loosened domain
cap) — those changes will be trivial diffs against the helper with
regression coverage.

236 of 292 branches covered (80.82%)

Branch coverage included in aggregate %.

9 of 9 new or added lines in 1 file covered. (100.0%)

753 of 772 relevant lines covered (97.54%)

538709.68 hits per line