milestone 27: diagnostics — operational failures land in one curated log, resolved history purgeable

src/tests.zig

@@ -76,6 +76,9 @@ comptime {
     _ = @import("server/rate_limiter.zig");
     _ = @import("storage/repositories/queries_repo.zig");
     _ = @import("storage/repositories/upstream_history_repo.zig");
+    _ = @import("storage/repositories/events_repo.zig");
+    _ = @import("storage/events.zig");
+    _ = @import("storage/events_fixture.zig");
     _ = @import("upstream/history.zig");
     _ = @import("storage/logger.zig");
     _ = @import("platform/statfs.zig");
@@ -100,6 +103,7 @@ comptime {
     _ = @import("web/metrics.zig");
     _ = @import("web/handlers/stats.zig");
     _ = @import("web/handlers/queries.zig");
+    _ = @import("web/handlers/diagnostics.zig");
     _ = @import("web/handlers/lookup.zig");
     _ = @import("web/handlers/upstream_health.zig");
     _ = @import("web/handlers/health.zig");