Let a module declare a log the controller creates and never removes (ADR 0297)

The issue tracker's history lasts seven days on the events stream and its
bucket fills toward a cap with no warning (issues 501, 502). A module may
now declare `logs`; the controller creates each as a stream on the bus
(create-or-update, never deleted or recreated, reported when undeclared),
issues it to the owner's assignments in their membership, grants the
runtime exactly the append and direct-read subjects, and raises a
condition when any module's bucket or log reaches 75% of its cap, cleared
below 70%.

internal/broker/membership.go

@@ -51,6 +51,10 @@ type Membership struct {
 	// and refuses, with the reason, what is not on it — the bus enforces only the union over every
 	// module on the machine.
 	State []StateIssued `json:"state,omitempty"`
+	// Logs is every log this module's code may reach, by the name it uses for each (novox/hq ADR 0297):
+	// its own and no other's, since a log is its owner's alone. The runtime answers a bundle's log verbs
+	// from this list and refuses, with the reason, a log not on it.
+	Logs []LogIssued `json:"logs,omitempty"`
 	// SeatTraffic is what this module's code may submit, say, hear, take, ask, answer and read on seats
 	// that name their caller or their kind (novox/hq ADR 0259 §3). The runtime carrying the module
 	// publishes, takes and answers for it only what is listed here: the bus enforces only the union
@@ -121,6 +125,7 @@ func MembershipFor(node string, d Declared, where Placements) Membership {
 		}
 	}
 	m.State = stateIssuedFor(d, node)
+	m.Logs = logsIssuedFor(d)
 	t := SeatTrafficOf(d.Module, d.Holds, d.Uses, d.Watches)
 	for _, s := range append(append([]Seat{}, d.Uses...), d.Watches...) {
 		if !s.Kinded {