vgsp-gr: m155 extend the re-arm with the mode-35 lane-enable tail (HF-3)

r154: after the second client's idle period the FECS saved/unloaded the
context (SKED rec: cwd0=0x12486 fecs_cur=b0633ee3 -> cwd0=0x2086 fecs_cur=0
and no change ever after) and every later forwarded launch acked
(qmd_rel/ch_rel) while dispatching nothing - including all three outcome
retries with fresh ring entries (0/205 changed, 720 ms no-writes, x4).
Re-issuing only GPFIFO_SCHEDULE+TSG_GPFIFO_SCHEDULE+doorbell did not
revive dispatch. The extended re-arm now replays the mode-35 lane-enable
tail first (GR_SET_CTXSW_PREEMPTION_MODE CILP + SET_TIMESLICE +
DEVICE_SCHED - the proven-accepted stage-4 sequence, HF-3 design), then
the schedules and the doorbell. Poison variants (explicit PREEMPT/tail,
BIND, PROMOTE) remain excluded.

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