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test(stratum): extract reconnect backoff state machine (TA-234) (#191)

fourth target of the TA-234 seam-for-testability pass. stratum's
exponential backoff (5s→60s cap, reset on success, reset+wifi-kick at
5 consecutive failures) was inline in the connect loop with two
file-scope statics. extract to stratum_backoff.{c,h} as a pure state
machine taking stratum_backoff_t * — no FreeRTOS dependency.

6 host tests cover:
- init defaults
- first-failure sleep + pre-doubled delay
- 5/10/20/40 progression then kick
- 60s cap clamp
- reset clears both fields
- post-kick + reset restarts cleanly

unblocks the TA-232 fix (cap at 30s, fast-recovery on first SYN
success) — those policy tweaks become trivial diffs in
stratum_backoff.c with regression coverage.

stratum.c: drops s_reconnect_delay_ms / s_connect_fail_count /
STRATUM_WIFI_KICK_THRESHOLD; uses s_backoff struct via the helper.
the late-loop reconnect path (after handshake/timeout failures)
also calls stratum_backoff_on_fail and respects the kick outcome,
which the inline version did not — minor behavior fix bundled.

232 of 288 branches covered (80.56%)

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