add NIP-21 content tags (q/p) to issues, comments, PRs and patches

- parse nostr: URI mentions in issue bodies, comment bodies, PR
  descriptions, patch commit messages and cover letters
- npub/nprofile mentions produce p tags; note/nevent/naddr mentions
  produce q tags per NIP-22
- naddr q tag value uses raw <kind>:<pubkey-hex>:<identifier> format
- nevent pubkey field populated from embedded author or local cache lookup
- dedup_tags() removes duplicate p tags and suppresses q tags whose
  event-id is already covered by an existing e threading tag
- all parsing errors are non-fatal: invalid nostr: tokens are skipped

1 files changed, 1 insertions, 0 deletions

diff --git a/src/lib/mod.rs b/src/lib/mod.rs
index f839e7f..9768343 100644
--- a/src/lib/mod.rs
+++ b/src/lib/mod.rs
@@ -1,6 +1,7 @@
 pub mod accept_maintainership;
 pub mod cli_interactor;
 pub mod client;
+pub mod content_tags;
 pub mod fetch;
 pub mod git;
 pub mod git_events;