rename sched to scheduler

src/kernel/main.zig

@@ -4,7 +4,7 @@ const arch = @import("arch");
 const console = @import("console.zig");
 const pmm = @import("pmm.zig");
 const heap = @import("heap.zig");
-const sched = @import("sched.zig");
+const scheduler = @import("scheduler.zig");
 const tests = @import("tests.zig");
 const build_options = @import("build_options");
 const BootInfo = danos.BootInfo;
@@ -103,7 +103,7 @@ fn kmain(boot_info: *const BootInfo) noreturn {
     serial0.debugPrint("  Kernel FootdebugPrint: {d} KiB\n", .{kib(s1.free_frames - s2.free_frames)});
 
     // Register the current context as the first task before enabling preemption.
-    sched.init(4);
+    scheduler.init(4);
     serial0.debugWrite("\ndanos: scheduler online\n");
 
     // Start the timer and unmask interrupts — the kernel now has a heartbeat, and