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, 3 deletions

diff --git a/grasp-audit/src/fixtures.rs b/grasp-audit/src/fixtures.rs
index 174f83d..a15bd79 100644
--- a/grasp-audit/src/fixtures.rs
+++ b/grasp-audit/src/fixtures.rs
@@ -1973,11 +1973,11 @@ mod tests {
 
     #[test]
     fn test_context_mode_from_audit_mode() {
-        assert_eq!(ContextMode::from(AuditMode::Isolated), ContextMode::Isolated);
         assert_eq!(
-            ContextMode::from(AuditMode::Shared),
-            ContextMode::Shared
+            ContextMode::from(AuditMode::Isolated),
+            ContextMode::Isolated
         );
+        assert_eq!(ContextMode::from(AuditMode::Shared), ContextMode::Shared);
     }
 
     #[test]