vgsp-sema r563b: the stall self-heal clears the walk-state blockers (force opdef flush + per-channel state)

r564 evidence: the STALL-DUMPs fired (4x, done=12700 held=727 frozen) but
ZERO STALL-HEAL lines - the force-consume budget never engaged because the
walk breaks BEFORE the instrumented hold sites (the cheap-wait unread
window at the loop top, or a stale GR hold/nocap index). The self-heal now
acts on the state every break site consults:
 - svc_opdef_force_flush(): deliver every withheld release forward-only,
   record the delivered marks (so a re-decode cannot re-hold), clear the
   slots - the same edge the 3 s bound would run, at the watchdog's
   discretion;
 - per channel (under chan_lock): unread_va/unread_until = 0 (the
   cheap-wait break), gr_hold_idx/gr_hold_until/gr_nocap_idx/gr_nocap_va
   reset;
 - the force-consume budget stays as the belt for the hold sites.
One loud STALL-HEAL line per firing.

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