fix(mcp): advertise process.start in channel capability

Sync the claude/channel capability list with the process lifecycle events emitted by the service.

Co-Authored-By: Virgil <virgil@lethean.io>

pkg/mcp/notify.go

@@ -114,6 +114,7 @@ func channelCapability() map[string]any {
 				"brain.remember.complete",
 				"brain.recall.complete",
 				"inbox.message",
+				"process.start",
 				"process.exit",
 				"harvest.complete",
 				"test.result",

pkg/mcp/notify_test.go

@@ -64,4 +64,15 @@ func TestChannelCapability_Good(t *testing.T) {
 	if len(channels) == 0 {
 		t.Fatal("expected at least one channel in capability definition")
 	}
+
+	foundProcessStart := false
+	for _, channel := range channels {
+		if channel == "process.start" {
+			foundProcessStart = true
+			break
+		}
+	}
+	if !foundProcessStart {
+		t.Fatal("expected process.start to be advertised in capability definition")
+	}
 }