feat(cover-note): add kind-1624 cover notes for PRs, patches, and issues

Implements experimental kind-1624 cover note events:

- KIND_COVER_NOTE constant and process_cover_note() in git_events.rs;
  replaceable semantics (latest created_at, hex-id tiebreak), author or
  maintainer only
- kind-1624 events fetched alongside labels in the fetch pipeline;
  cover_notes count added to FetchReport display
- ngit pr/issue view: cover note displayed in place of description with
  a clear 'Cover Note:' header; maintainer-authored notes identify the
  author; original description shown only with --comments; cover_note
  object included in --json output
- ngit pr set-cover-note / ngit issue set-cover-note: publish a
  kind-1624 event; nostr: mentions in --body converted to q/p tags via
  tags_from_content (same rules as issue --body)
- Fix pre-existing clippy::too_many_lines on repo/mod.rs show_info

1 files changed, 8 insertions, 1 deletions

diff --git a/src/bin/ngit/sub_commands/whoami.rs b/src/bin/ngit/sub_commands/whoami.rs
index be79c79..19ce573 100644
--- a/src/bin/ngit/sub_commands/whoami.rs
+++ b/src/bin/ngit/sub_commands/whoami.rs
@@ -154,7 +154,14 @@ async fn load_user_for_scope(
 ) -> Option<(String, String, Option<String>)> {
     // First verify signer info exists for this scope without building a full
     // signer — avoids triggering password prompts for ncryptsec.
-    if get_signer_info(&git_repo, &signer_info.cloned(), &None, &Some(source.clone())).is_err() {
+    if get_signer_info(
+        &git_repo,
+        &signer_info.cloned(),
+        &None,
+        &Some(source.clone()),
+    )
+    .is_err()
+    {
         return None;
     }