internal/outcome: rename from app

This is less ambiguous, and more accurately describes the purpose of the package.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/outcome/main.go

@@ -0,0 +1,27 @@
+package outcome
+
+import (
+	"context"
+	"log"
+	"os"
+
+	"hakurei.app/hst"
+	"hakurei.app/message"
+)
+
+// Main runs an app according to [hst.Config] and terminates. Main does not return.
+func Main(ctx context.Context, msg message.Msg, config *hst.Config) {
+	var id hst.ID
+	if err := hst.NewInstanceID(&id); err != nil {
+		log.Fatal(err.Error())
+	}
+
+	seal := outcome{syscallDispatcher: direct{msg}}
+	if err := seal.finalise(ctx, msg, &id, config); err != nil {
+		printMessageError("cannot seal app:", err)
+		os.Exit(1)
+	}
+
+	seal.main(msg)
+	panic("unreachable")
+}