Key root-not-free apart from DA, keep ADR 0266's quiet window there, and judge at one clock (hq ADR 0259 §8)

The confirmation review of 2026-10-09 found D-root and DA writing one key, machine.<m>.agent-root, from
two probes with different words, so it flapped every run; D-root is now root-not-free. D-root raised the
urgent condition after every node-engine restart while the first setuid search ran; it now keeps the
same quiet window as DA, and the root-free verb still answers that machine not free. agentConfined
takes the judging clock.

cmd/mesh-controller/doctor.go

@@ -130,7 +130,7 @@ var probeRegistry = []probe{
 	// person, an answer proven there proves nothing.
 	{ID: "D-root", Asserts: "no agent can become root without a person on a machine where the router or a channel " +
 		"proving its sender runs: not by its own account, and not through a tool that runs its command as an account " +
-		"that can", From: "ADR 0259 §8", Kind: kindAgentRoot, Phase: 2, run: probeAgentRoot},
+		"that can", From: "ADR 0259 §8", Kind: kindRootNotFree, Phase: 2, run: probeAgentRoot},
 	{ID: "DW", Asserts: "the watchdogs of the signals table ran within three of their intervals",
 		From: "ADR 0227 rule 6: the watchers are watched", Kind: "watchdogs-silent", Phase: 1, run: probeWatchdogs},
 	// The core's health definitions (novox/hq to-be 45 §8, ADR 0236): what a core component's new build is