gr: r405b late-write probes - retire LATE-PROBE (+500 ms re-scan) and a tunable settle window (gsp_phys_gr_settle_ms)

The r405 streams2 forensics show a new shape of the no-write class: the
in-place scale launch wrote 1 of its 32 expected pages and the
partial-changed count was content-stable for 300 ms, so the retire wait
declared 'settled' and the copy-out shipped one page. Two runtime knobs
discriminate and test the fix in one cycle: gsp_phys_gr_late_probe=1
re-scans +500 ms after the retire wait and logs whether the engine was
still writing; gsp_phys_gr_settle_ms raises the content-stable window
(default 300 ms).

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