fix: resolve all fmt and clippy warnings

Main lib (src/):
- Add #[allow(dead_code)] for build_info field (stored to prevent Prometheus unregistration)
- Add #[allow(dead_code)] for first_seen field (reserved for future rate limiting)
- Replace .or_insert_with(RelaySyncNeeds::default) with .or_default()
- Replace manual div_ceil implementations with .div_ceil(100)

Test code (tests/):
- Replace .expect(&format!(...)) with .unwrap_or_else(|_| panic!(...))
- Remove needless borrows in fetch_metrics() calls
- Add #[allow(dead_code)] and #[allow(unused_imports)] to test helpers module

grasp-audit:
- Apply cargo fmt to fix formatting

1 files changed, 3 insertions, 1 deletions

diff --git a/grasp-audit/src/client.rs b/grasp-audit/src/client.rs
index 21c70be..259a317 100644
--- a/grasp-audit/src/client.rs
+++ b/grasp-audit/src/client.rs
@@ -585,7 +585,9 @@ mod tests {
             "Missing 'grasp-audit-test-event' tag"
         );
         assert!(
-            tag_contents.iter().any(|t| t.starts_with("audit-isolated-")),
+            tag_contents
+                .iter()
+                .any(|t| t.starts_with("audit-isolated-")),
             "Missing 'audit-isolated-*' tag"
         );
         assert!(