chore: pass fmt clippy and nextest checks

Format merged Rust sources, satisfy strict clippy lints, and restore documentation fixtures required by format registry tests.

Validation: cargo fmt --all --check; CI-scoped clippy with -D warnings; cargo nextest workspace excluding integration tests, 9747 passed and 47 skipped; targeted PostgreSQL analytics regression passed.

apps/aether-gateway/src/execution_activity.rs

@@ -267,9 +267,9 @@ impl History {
     fn snapshot(&mut self, now_us: u64, started_at_us: i64) -> Value {
         self.advance(now_us);
         let mut providers: Vec<_> = self.providers.iter().collect();
-        providers.sort_unstable_by(|(a, _), (b, _)| a.cmp(b));
+        providers.sort_unstable_by_key(|(provider, _)| *provider);
         let mut models: Vec<_> = self.models.iter().collect();
-        models.sort_unstable_by(|(a, _), (b, _)| a.cmp(b));
+        models.sort_unstable_by_key(|(model, _)| *model);
         json!({
             "observed_at": DateTime::from_timestamp_micros(started_at_us.saturating_add(self.through_us.min(i64::MAX as u64) as i64)),
             "observed_from": DateTime::from_timestamp_micros(started_at_us),

apps/aether-gateway/src/handlers/shared/health_monitor/api.rs

@@ -180,7 +180,7 @@ pub(super) fn public_projection(
             exclusion_policy: "client_cancelled_invalid_input_identity_or_quota_policy",
         },
         average_latency_ms: (metrics.latency_sample_count > 0)
-            .then(|| metrics.latency_sum_ms as f64 / metrics.latency_sample_count as f64),
+            .then(|| metrics.latency_sum_ms / metrics.latency_sample_count as f64),
         latency_sample_count: metrics.latency_sample_count,
         last_request_at: metrics.last_request_at_unix_ms.and_then(unix_ms_to_rfc3339),
         timeline: Vec::new(),

apps/aether-gateway/src/tests/control/admin/system.rs

@@ -1237,7 +1237,9 @@ async fn gateway_handles_admin_system_users_export_locally_with_trusted_admin_pr
     assert!(payload["users"][0]["api_keys"][0]
         .get("credential_kind")
         .is_none());
-    assert!(payload["standalone_keys"][0].get("credential_kind").is_none());
+    assert!(payload["standalone_keys"][0]
+        .get("credential_kind")
+        .is_none());
     assert!(payload["exported_at"].as_str().is_some());
     assert_eq!(payload["user_groups"][0]["name"], "Restricted GPT");
     assert!(payload["user_groups"][0].get("priority").is_none());

apps/aether-gateway/src/tests/frontdoor/public_support.rs

@@ -50,10 +50,10 @@ use chrono::{TimeZone, Utc};
 const TEST_EMAIL_VERIFICATION_TOKEN: &str =
     "test-email-verification-token-00000000000000000000000000000000";
 
-#[path = "public_support/auth_cookie.rs"]
-mod auth_cookie;
 #[path = "public_support/announcement_user_list.rs"]
 mod announcement_user_list;
+#[path = "public_support/auth_cookie.rs"]
+mod auth_cookie;
 #[path = "public_support/dashboard.rs"]
 mod dashboard;
 #[path = "public_support/vscodex.rs"]