Event names are checked now, per manifest and across the catalogue

Issue 127 stood because nothing compared the two halves. Every manifest was
well-formed on its own and every derivation correct on its own, and no
cross-module subscription in the mesh matched anything — a subscription that
matches nothing is not an error, it is silence.

Two checks, because the mistake is possible at two scales.

Per manifest: an event is a local name, and `module.` is refused with the name to
write instead. A module emitting under what reads as another module's name is
refused too, pointing at the seat, where a name outlives whoever holds it.

Across the catalogue: where a consumed event's emitter is present, it must emit
that event. It cannot demand a live emitter for everything — a module lives in its
own repository and may be installed long before the one whose events it wants — so
the rule is narrower and still catches this. It found two real dangling
subscriptions the moment it ran.

Wildcards were undecided and two manifests needed them: `*` is one name and `**`
is the rest, spelled the mesh's way and derived to `>` here and `#` on the old bus.
A manifest naming either would stop being true when the wire changed, which is the
whole reason names are local.

And the field documentation taught the old form, examples included — which is why
the drift was uniform across 37 manifests rather than scattered. Nobody was
guessing; everybody followed the comment.

internal/broker/derived.go

@@ -85,8 +85,12 @@ func SeatStreams(seats []DeclaredSeat) []Stream {
 // package stays free of the catalogue's own types — the same reason the host mirrors the
 // contracts instead of importing the sdk.
 type DeclaredSeat struct {
-	Name          string
-	Accepts       []string
+	Name    string
+	Accepts []string
+	// Emits are the verbs the seat's holder publishes under the seat's own name. An event about a
+	// role belongs here rather than in the holder's namespace, because the name then outlives
+	// whoever fills it (novox/hq 04-ISSUES/127).
+	Emits         []string
 	RetainSeconds int
 }