feat(purgatory): track event source for filtered expiry logging

Add EventSource enum (Direct/Sync) to purgatory entries to distinguish
between user-submitted events and sync-fetched events. This enables:

- WARN-level logging for direct submissions that expire (user should know)
- DEBUG-level logging for sync-fetched expirations (expected behavior)
- Source upgrade from Sync→Direct if user submits after sync
- Expiry timer reset on source upgrade (fresh 30-min window for user)

The source is included in [PURGATORY_EXPIRED] logs as source=direct or
source=sync for easy filtering.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/nostr/builder.rs b/src/nostr/builder.rs
index 629c111..9211972 100644
--- a/src/nostr/builder.rs
+++ b/src/nostr/builder.rs
@@ -399,7 +399,7 @@ impl Nip34WritePolicy {
                 // Add to purgatory
                 self.ctx
                     .purgatory
-                    .add_pr(event.clone(), event.id.to_hex(), commit.clone());
+                    .add_pr(event.clone(), event.id.to_hex(), commit.clone(), is_synced);
 
                 WritePolicyResult::Reject {
                     status: true, // Client sees OK