Return a grant not written and retry the take-in under a condition; drop the plans' events; grant bucket-deleted, restic's backup word and the operator's hand path (issue 1945; the review's D1, F1, H1 and its notes)

With no send left nothing else writes a missed grant, so the take-in of a done key returns it and tries again every
half minute under an urgent condition until it is written. plan-moved and sent go with the plans. The controller's
first-start deletions are said on a granted subject, a node hears only its backup holder, and the operator's account
writes the hand path, an object replaced included (ADR 0539 clauses 2, 7, 10 and 13).

internal/link/events.go

@@ -73,15 +73,7 @@ const (
 	// KeyRolledBack: a build failed its gate on its first machine and was put back there, or could not
 	// be (novox/hq ADR 0236, to-be 45 §8); or a witness on a machine put a core component back.
 	KeyRolledBack = "rolled-back"
-	// KeySent: a plan's tier was sent to a machine, and the send kept (novox/hq ADR 0406 §5, issue 974): the plan, the tier,
-	// the machine, the modules and when. What an outsider hears of a rollout; the controller's own next step does not
-	// wait for it.
-	KeySent = "sent"
-	// KeyPlanMoved: a walk — the controller's plan of one trunk commit, tier by tier across the machines —
-	// was kept in a new state (novox/hq ADR 0239): the plan whole, for the delivery it walks to read its
-	// steps from. Said after every save of the serving controller; a delivery's holder also asks for the
-	// walks it follows, so a save made elsewhere is found by comparison, never lost.
-	KeyPlanMoved = "plan-moved"
+	// (No plan is kept or sent any more, novox/hq ADR 0539: the events plan-moved and sent are gone with them.)
 	// KeyAssignmentChanged and KeyDeclaredConfigChanged: a key of the controller's assignments or declared-config
 	// mirror was written or removed (novox/hq ADR 0289, design 54 §3, design 57 F3): which key, how and at which
 	// revision of the bucket — never the value, which the bucket holds.