milestone 6: dns cache, rate limiting, query logging, disk monitoring and retention

src/main.zig

@@ -4,6 +4,12 @@
 
 const std = @import("std");
 const cli = @import("cli.zig");
+const logging = @import("platform/logging.zig");
+
+/// Routes every `std.log` call through the sink. Before `logging.install`
+/// runs (and always under the test runner, which never installs), the sink
+/// passes through to the stderr default.
+pub const std_options: std.Options = .{ .logFn = logging.logFn };
 
 // `src/tests.zig` imports this file, and this is how `cli.zig`'s tests reach
 // the same runner. `src/tests.zig` is the orchestrator's file, not this