feat: handle deletion of PR/PR-update events from purgatory

Kind 5 deletion events referencing a PR or PR-update event by e-tag now
remove the matching purgatory entry, provided the deletion author matches
the PR event author. Placeholders (git data arrived before the event) are
not removed since they have no author to verify against.

PR purgatory is keyed by event ID hex so this is an O(1) lookup, checked
before the O(n) announcement and state event scans.

1 files changed, 22 insertions, 2 deletions

diff --git a/src/nostr/policy/deletion.rs b/src/nostr/policy/deletion.rs
index 01241c9..6457c90 100644
--- a/src/nostr/policy/deletion.rs
+++ b/src/nostr/policy/deletion.rs
@@ -81,9 +81,9 @@ impl DeletionPolicy {
         }
     }
 
-    /// Remove a purgatory entry (announcement or state event) matched by event ID.
+    /// Remove a purgatory entry (announcement, state event, or PR event) matched by event ID.
     ///
-    /// Checks announcements first (kind 30617), then state events (kind 30618).
+    /// Checks in order: announcements (30617), state events (30618), PR/PR-update events.
     /// Only removes entries whose author matches `author`.
     fn remove_by_event_id(
         &self,
@@ -91,6 +91,26 @@ impl DeletionPolicy {
         target_id_hex: &str,
         _deletion_created_at: u64,
     ) {
+        // --- Check PR events (kind 1617/1618) first — O(1) direct lookup ---
+        // PR purgatory is keyed by event ID hex, so this is the cheapest check.
+        // Only remove if the entry has an actual event (not a placeholder) and the
+        // event's author matches the deletion request author.
+        if let Some(entry) = self.ctx.purgatory.find_pr(target_id_hex) {
+            if let Some(ref event) = entry.event {
+                if event.pubkey == *author {
+                    tracing::info!(
+                        event_id = %target_id_hex,
+                        author = %author.to_hex(),
+                        "Deletion request: removing purgatory PR event by event ID"
+                    );
+                    self.ctx.purgatory.remove_pr(target_id_hex);
+                    return;
+                }
+            }
+            // Entry exists but is a placeholder or wrong author — don't remove
+            return;
+        }
+
         // --- Check announcements (kind 30617) ---
         // The DashMap doesn't expose a direct "find by event ID" method, so we use
         // the announcements_for_sync snapshot to enumerate all (repo_id, _) pairs.