gr: default wedge quiet window 40 s (r417 live: a 20 s host hold did not heal, the next 40 s hold did - legit engine writes resumed)

r417 reproduced the wedge deterministically with wedge_recover v2 (ITER 0
green, ITER 1 zero-write, both with the legacy win0 shadow path on and
with the icache-invalidate bit forced off - the bit is not the trigger)
and exercised the r410 quiet path for the first time: the 20 s hold left
the outcome at 0 pages, the following 40 s hold logged 'WEDGE-QUIET
healed: engine wrote 1 page(s) after the 40000 ms hold (streak was 1)'.
A shadow-win0=0 A/B showed the engine executes but fetches the wrong
program in that legacy shape (all-32768 wrong), so the win0 shadow path
stays on. Default base raised to 40 s so the first hold heals instead of
paying 20 s + 40 s.

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