Move legacy job repair to migration 0011 and keep archived dinners pending

R1-A: Migration 0010 is back to its round-2 content, the ALTER TABLE only,
since a database that already applied 0010 never runs it again. The
repair that writes revision 0 into ground_dinner job payloads without one
is now migration 0011, applied by the same boot Migrate call, so before
the job runner starts and before FailInterruptedGroundings.
TestUpgradeKeepsLegacyQueuedGrounding now upgrades from 0009 and from a
database with 0010 already recorded, each with a pending Regular and a
queued legacy job; both keep the dinner pending through the boot cleanup
and then ground it.

R2-A: The boot cleanup no longer fails archived dinners. Archiving stops a
running job and leaves the dinner pending, which the cleanup relabelled
failed with interrupted. TestRestartKeepsArchivedPendingDinner archives a
pending Regular while its job runs and checks the cleanup leaves it
pending with no error.

Maestro task 5037ff86-181d-448e-927b-c2fd2258a25d.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/dinners/grounding.go

@@ -227,10 +227,11 @@ func (s *Service) stopGroundings(dinnerID string, below int64) {
 	}
 }
 
-// FailInterruptedGroundings fails, with ReasonInterrupted, every dinner
-// still pending whose KindGroundDinner job is no longer queued or running:
-// a previous process stopped before enqueuing the job or before its
-// handler recorded a result. Call it once at boot, after the job runner's
+// FailInterruptedGroundings fails, with ReasonInterrupted, every unarchived
+// dinner still pending whose KindGroundDinner job is no longer queued or
+// running: a previous process stopped before enqueuing the job or before
+// its handler recorded a result. An archived dinner is left pending, since
+// archiving, not a restart, stopped its grounding. Call it once at boot, after the job runner's
 // Start has failed the jobs that process left running, so no dinner stays
 // pending with nothing left to ground it. It returns how many it failed.
 func (s *Service) FailInterruptedGroundings(ctx context.Context) (int64, error) {