Judge a send by when a fault began, not when it was last raised (hq issue 348)

On 2026-10-09 the control node's resolver refused from 10:57:57 UTC. A
node-engine restarted by the 10:59:34 send said its names undecided, that
statement cleared the network condition, the next look raised it again
after the send, and the gate put back two builds for a fault older than
them.

- A condition keeps First across a reopening; the gate reads Began.
- An undecided network statement (unknown, starting) clears nothing.
- D10 counts what a release's tier names as rolling, so a walked
  node-engine is not core-behind on its own first machine.
- D2 raises a resolver that refuses every try at once: a refusal is an
  answer, not a loaded resolver (issue 277).

internal/conditions/condition.go

@@ -145,6 +145,11 @@ type Condition struct {
 	// Raised is when it was first observed this time; LastObserved the newest observation.
 	Raised       time.Time `json:"raised"`
 	LastObserved time.Time `json:"last-observed"`
+	// First is when this fault was first raised, a reopening within ReopenWithin counted as the same
+	// fault: Raised of the first raising. Absent on one written before it was kept, and on a first
+	// raising, where it is Raised (Began). A reopening is the same fault, so what asks when a fault began
+	// — the gate, asking whether it began after a send — reads Began, never Raised (novox/hq issue 348).
+	First time.Time `json:"first,omitzero"`
 	// Observations is how many times it was observed since raised.
 	Observations int `json:"observations"`
 	// Count is how many times it has been raised, a reopening within ReopenWithin counted.
@@ -274,3 +279,14 @@ func Order(list []Condition) {
 		return list[i].Key < list[j].Key
 	})
 }
+
+// Began is when this fault began as the mesh knows it: its first raising, a reopening within
+// ReopenWithin being the same fault again (novox/hq issue 348). A condition that cleared on a statement
+// that judged nothing yet — a node-engine just restarted — and was raised again a minute later began
+// when it was first raised, not at the reopening.
+func (c Condition) Began() time.Time {
+	if !c.First.IsZero() && c.First.Before(c.Raised) {
+		return c.First
+	}
+	return c.Raised
+}