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test(stratum): extract job/share/keepalive watchdog predicates (TA-234) (#194)

seventh target of the TA-234 seam-for-testability pass. stratum's
three time-based watchdogs (5min job drought, 30min share drought,
90s keepalive) were inline in the main connect loop with magic-number
tick conversions. extract to stratum_watchdogs.{c,h} as three pure
predicates over (now_ms, last_*_ms) — uint32_t mirrors FreeRTOS tick
semantics so single-wraparound is naturally correct.

stratum.c converts ticks → ms once at the call site via
pdTICKS_TO_MS, then defers the threshold decision to the helper.

16 host tests cover never-observed (last_ms == 0), below-threshold,
at-threshold, above-threshold paths for each predicate, plus the
share-drought "last_share preferred over session_start" semantics.

ties into TA-232 / TA-233 (stratum failures must not block UI) —
those policy tweaks are now trivial diffs over tested helpers.

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

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