Add tracked dependencies to subscriptions

[no changelog]

symbols/src/main/kotlin/process/SubscribeAnnotationProcessor.kt

@@ -30,9 +30,10 @@ class SubscribeAnnotationProcessor(
     val codeGenerator: CodeGenerator,
 ) : SymbolProcessor {
     override fun finish() {
+        val subscriptionSet = subscriptions.mapTo(mutableSetOf()) { it.parent.containingFile!! }
         val dependencies = Dependencies(
             aggregating = true,
-            *subscriptions.mapTo(mutableSetOf()) { it.parent.containingFile!! }.toTypedArray())
+            *subscriptionSet.toTypedArray())
         val subscriptionsFile =
             codeGenerator
                 .createNewFile(dependencies, "moe.nea.firmament.annotations.generated", "AllSubscriptions")
@@ -41,6 +42,9 @@ class SubscribeAnnotationProcessor(
             appendLine("// This file is @generated by SubscribeAnnotationProcessor at ${SimpleDateFormat("yyyy-MM-dd HH:mm:ss z").format(
                 Date())}")
             appendLine("// Do not edit")
+            for (file in subscriptionSet) {
+                appendLine("// Dependency: ${file.filePath}")
+            }
             appendLine("package moe.nea.firmament.annotations.generated")
             appendLine()
             appendLine("import moe.nea.firmament.events.subscription.*")