test: verify NIP-22 comments work on podcast episodes; add RootScope marker

Verification of kind:1111 comments on podcast episodes: they already work
end-to-end (parse, build, route to the thread screen, thread assembly, composer,
and the reply/reaction subscriptions all treat any kind as a valid root — nothing
gates on the RootScope marker). Added a quartz test that drives the real
CommentEvent.replyBuilder path and asserts:
- a comment on a Podcasting-2.0 episode (30054) roots on its `a`/`A` address,
- a comment on a NIP-F4 episode (54) roots on its `e`/`E` event id,
- both are kind:1111 and carry the root-kind tag.

Also closes a small consistency gap: every other commentable content type
(articles, all video kinds, pictures, highlights, wiki, polls, …) implements the
RootScope marker, but the podcast events did not. Add it to PodcastEpisodeEvent,
Podcasting20EpisodeEvent and Podcasting20TrailerEvent. Harmless today (no code
does `is RootScope`), but it documents intent and future-proofs any such check.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JGa1EM5KWyDo1o5Yr6sS18

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nipF4Podcasts/episode/PodcastEpisodeEvent.kt

@@ -25,6 +25,7 @@ import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
 import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
+import com.vitorpamplona.quartz.nip22Comments.RootScope
 import com.vitorpamplona.quartz.nip50Search.SearchableEvent
 import com.vitorpamplona.quartz.nipF4Podcasts.episode.tags.AudioTag
 import com.vitorpamplona.quartz.nipF4Podcasts.episode.tags.DescriptionTag
@@ -51,6 +52,7 @@ class PodcastEpisodeEvent(
     sig: HexKey,
 ) : Event(id, pubKey, createdAt, KIND, tags, content, sig),
     PodcastEpisode,
+    RootScope,
     SearchableEvent {
     override fun indexableContent() = listOfNotNull(title(), description(), content).joinToString("\n")
 

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nipXXPodcasting20/episode/Podcasting20EpisodeEvent.kt

@@ -27,6 +27,7 @@ import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
 import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
 import com.vitorpamplona.quartz.nip01Core.tags.dTag.dTag
 import com.vitorpamplona.quartz.nip01Core.tags.hashtags.hashtags
+import com.vitorpamplona.quartz.nip22Comments.RootScope
 import com.vitorpamplona.quartz.nip31Alts.AltTag
 import com.vitorpamplona.quartz.nip31Alts.alt
 import com.vitorpamplona.quartz.nip50Search.SearchableEvent
@@ -65,6 +66,7 @@ class Podcasting20EpisodeEvent(
     sig: HexKey,
 ) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig),
     PodcastEpisode,
+    RootScope,
     SearchableEvent {
     override fun indexableContent() = listOfNotNull(title(), description(), content).joinToString("\n")
 

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nipXXPodcasting20/trailer/Podcasting20TrailerEvent.kt

@@ -26,6 +26,7 @@ import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
 import com.vitorpamplona.quartz.nip01Core.signers.eventTemplate
 import com.vitorpamplona.quartz.nip01Core.tags.dTag.dTag
+import com.vitorpamplona.quartz.nip22Comments.RootScope
 import com.vitorpamplona.quartz.nip31Alts.AltTag
 import com.vitorpamplona.quartz.nip31Alts.alt
 import com.vitorpamplona.quartz.nipXXPodcasting20.episode.tags.PubDateTag
@@ -49,7 +50,8 @@ class Podcasting20TrailerEvent(
     tags: Array<Array<String>>,
     content: String,
     sig: HexKey,
-) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig),
+    RootScope {
     fun title() = tags.firstNotNullOfOrNull(TitleTag::parse)
 
     fun url() = tags.firstNotNullOfOrNull(UrlTag::parse)

quartz/src/commonTest/kotlin/com/vitorpamplona/quartz/podcasts/PodcastCommentScopeTest.kt

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.podcasts
+
+import com.vitorpamplona.quartz.nip01Core.core.Event
+import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
+import com.vitorpamplona.quartz.nip22Comments.CommentEvent
+import com.vitorpamplona.quartz.nip22Comments.RootScope
+import com.vitorpamplona.quartz.nipF4Podcasts.episode.PodcastEpisodeEvent
+import com.vitorpamplona.quartz.nipF4Podcasts.episode.tags.AudioTag
+import com.vitorpamplona.quartz.nipXXPodcasting20.episode.Podcasting20EpisodeEvent
+import com.vitorpamplona.quartz.utils.DeterministicSigner
+import com.vitorpamplona.quartz.utils.nsecToKeyPair
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+/**
+ * Verifies that NIP-22 (kind:1111) comments scope correctly onto podcast episodes of both drafts.
+ * The app's comment composer always routes through [CommentEvent.replyBuilder], so this exercises
+ * exactly the path a "reply to this episode" tap takes — proving comments already work end-to-end.
+ */
+class PodcastCommentScopeTest {
+    private val signer =
+        DeterministicSigner(
+            "nsec10g0wheggqn9dawlc0yuv6adnat6n09anr7eyykevw2dm8xa5fffs0wsdsr".nsecToKeyPair(),
+        )
+
+    @Test
+    fun `episode events declare themselves as NIP-22 comment roots`() {
+        // Consistency with every other commentable content type (articles, videos, …).
+        val pc20 =
+            signer.sign<Podcasting20EpisodeEvent>(
+                Podcasting20EpisodeEvent.build("ep-1", "E", listOf(PodcastAudio("https://x/a.mp3")), "Thu, 04 Nov 2023 12:00:00 GMT"),
+            )
+        val f4 =
+            signer.sign<PodcastEpisodeEvent>(
+                PodcastEpisodeEvent.build("E", "d", listOf(AudioTag("https://x/a.mp3"))),
+            )
+        assertTrue(pc20 is RootScope)
+        assertTrue(f4 is RootScope)
+    }
+
+    @Test
+    fun `comment on a Podcasting 2 point 0 episode roots on its address`() {
+        val episode =
+            signer.sign<Podcasting20EpisodeEvent>(
+                Podcasting20EpisodeEvent.build("ep-1", "Episode", listOf(PodcastAudio("https://x/a.mp3")), "Thu, 04 Nov 2023 12:00:00 GMT"),
+            )
+        val comment = signer.sign<CommentEvent>(CommentEvent.replyBuilder("great episode", EventHintBundle<Event>(episode)))
+
+        assertEquals(CommentEvent.KIND, comment.kind)
+        // Addressable root: the comment carries the episode's `a`/`A` address (30054:pubkey:d).
+        assertTrue(comment.rootAddressIds().contains(episode.addressTag()))
+        assertTrue(comment.hasRootScopeKind(Podcasting20EpisodeEvent.KIND.toString()))
+        assertTrue(comment.rootEventIds().contains(episode.id))
+    }
+
+    @Test
+    fun `comment on a NIP-F4 episode roots on its event id`() {
+        val episode =
+            signer.sign<PodcastEpisodeEvent>(
+                PodcastEpisodeEvent.build("Episode", "notes", listOf(AudioTag("https://x/a.mp3"))),
+            )
+        val comment = signer.sign<CommentEvent>(CommentEvent.replyBuilder("great episode", EventHintBundle<Event>(episode)))
+
+        assertEquals(CommentEvent.KIND, comment.kind)
+        // Regular (non-addressable) root: scoped by event id via the `e`/`E` tag, no address root.
+        assertTrue(comment.rootEventIds().contains(episode.id))
+        assertTrue(comment.hasRootScopeKind(PodcastEpisodeEvent.KIND.toString()))
+        assertTrue(comment.rootAddressIds().isEmpty())
+    }
+}