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/inventory/busrecords.go

@@ -166,6 +166,8 @@ func declaredFor(m catalogue.Manifest, seats map[string]catalogue.SeatDeclaratio
 		// And the state it keeps and reads (novox/hq ADR 0201).
 		State: bucketsOf(m),
 		Reads: m.Reads,
+		// And the logs it keeps (novox/hq ADR 0297).
+		Logs: logsOf(m),
 		// And the tools its health asks (novox/hq ADR 0240): the machine's node-engine is granted them.
 		Checks: catalogue.HealthChecks(m),
 		// And whether it runs as an account of its own (novox/hq ADR 0259 §8).
@@ -222,6 +224,29 @@ func (i *Inventory) DeclaredBuckets(ctx context.Context) ([]broker.Bucket, error
 	return out, nil
 }
 
+// logsOf is the logs a module keeps, as the bus holds them.
+func logsOf(m catalogue.Manifest) []broker.Log {
+	var out []broker.Log
+	for _, l := range m.Logs {
+		out = append(out, broker.Log{Module: m.Module, Name: l.Name, MaxMiB: l.Cap()})
+	}
+	return out
+}
+
+// DeclaredLogs is every log the catalogue declares, registered modules assigned or not: a log exists
+// from registration, as a bucket does (novox/hq ADR 0297 §2, ADR 0201 §6).
+func (i *Inventory) DeclaredLogs(ctx context.Context) ([]broker.Log, error) {
+	declared, err := i.Catalogue(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("cannot read the catalogue: %w", err)
+	}
+	var out []broker.Log
+	for _, m := range declared {
+		out = append(out, logsOf(m)...)
+	}
+	return out, nil
+}
+
 func asSeat(s catalogue.SeatDeclaration, declarer string) broker.Seat {
 	seat := broker.Seat{Name: s.Name, Scope: s.Scope, Accepts: s.Accepts, Emits: s.Emits,
 		Serves: catalogue.VerbNames(s.Serves), Kinded: s.Kinded, ByCaller: s.ByCaller, Proofs: s.Proofs,