vgsp: eng64 - chain the release behind the pack carrier and name a stalled carrier's gate

c779: the pack-continuation carrier completed the pack
(MME-CARRY-COMPLETE gen=4 off=2799/2799) and armed the release
(MME-CARRY-ARM mode=release), but its launch poll held the single
forwarding slot for 2801 ms; the armed release then deferred
request-inflight until the beef channel unregistered at +2.2 s, so the
release ended in MME-CARRY-HOLD reason=no-channel.

- svc_fwd_gr_work: after a successful synthetic pack carrier, wait out
  the release grace in the same slot, claim it and run the release work
  directly (chained MME-CARRY-FIRE mode=release ... receipt). Gate:
  sema_gl_mme_release_chain (default 1; release carrier still default 0).
- pump pack-carry block: an armed due carrier that cannot go out now
  names its blocker (MME-CARRY-WAIT reason=no-channel/client-candidate/
  request-inflight/fe-defer), so the c781-class silent stall is visible.
- booter: gsp_phys_gr_mme_release_waiting()/chain_enabled() helpers.

c783-c785 (a03a68ea build) were all shallow (author=0, no MME window).

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