refactor: move event_loop.zig and event_loop/ to core/

Event loop is core runtime infrastructure that belongs in the core/ directory.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/buntime/bindings/GeneratedJS2Native.zig

@@ -316,7 +316,7 @@ export fn JS2Zig___src_buntime_api_bun_socket_zig__jsSetSocketOptions(global: *j
     return @call(bun.callmod_inline, jsc.toJSHostFn(function.jsSetSocketOptions), .{ global, call_frame });
 }
 export fn JS2Zig___src_buntime_event_loop_zig__getActiveTasks(global: *jsc.JSGlobalObject, call_frame: *jsc.CallFrame) callconv(jsc.conv) jsc.JSValue {
-    const function = @import("../event_loop.zig");
+    const function = @import("../core/event_loop.zig");
     return @call(bun.callmod_inline, jsc.toJSHostFn(function.getActiveTasks), .{ global, call_frame });
 }
 export fn JS2Zig___src_install_hosted_git_info_zig__TestingAPIs_jsParseUrl(global: *jsc.JSGlobalObject, call_frame: *jsc.CallFrame) callconv(jsc.conv) jsc.JSValue {

src/buntime/core/event_loop.zig

@@ -697,8 +697,8 @@ pub const EventLoopHandle = @import("./event_loop/EventLoopHandle.zig").EventLoo
 pub const EventLoopTask = @import("./event_loop/EventLoopHandle.zig").EventLoopTask;
 pub const EventLoopTaskPtr = @import("./event_loop/EventLoopHandle.zig").EventLoopTaskPtr;
 
-pub const WorkPool = @import("../work_pool.zig").WorkPool;
-pub const WorkPoolTask = @import("../work_pool.zig").Task;
+pub const WorkPool = @import("../../work_pool.zig").WorkPool;
+pub const WorkPoolTask = @import("../../work_pool.zig").Task;
 
 const std = @import("std");
 const tickQueueWithCount = @import("./event_loop/Task.zig").tickQueueWithCount;

src/buntime/core/event_loop/Task.zig

@@ -528,7 +528,7 @@ const ProcessWaiterThreadTask = if (Environment.isPosix) bun.spawn.process.Waite
 
 const log = bun.Output.scoped(.Task, .hidden);
 
-const Fetch = @import("../web/fetch/fetch.zig");
+const Fetch = @import("../../web/fetch/fetch.zig");
 const FetchTasklet = Fetch.FetchTasklet;
 
 const JSCScheduler = @import("./JSCScheduler.zig");

src/buntime/jsc.zig

@@ -126,7 +126,7 @@ pub const js_property_iterator = @import("./bindings/JSPropertyIterator.zig");
 pub const JSPropertyIterator = js_property_iterator.JSPropertyIterator;
 pub const JSPropertyIteratorOptions = js_property_iterator.JSPropertyIteratorOptions;
 
-pub const EventLoop = @import("./event_loop.zig");
+pub const EventLoop = @import("./core/event_loop.zig");
 pub const AbstractVM = EventLoop.AbstractVM;
 pub const AnyEventLoop = EventLoop.AnyEventLoop;
 pub const AnyTask = EventLoop.AnyTask;

src/buntime/rare_data.zig

@@ -572,7 +572,7 @@ pub fn websocketDeflate(this: *RareData) *WebSocketDeflate.RareData {
     };
 }
 
-pub const SpawnSyncEventLoop = @import("./event_loop/SpawnSyncEventLoop.zig");
+pub const SpawnSyncEventLoop = @import("./core/event_loop/SpawnSyncEventLoop.zig");
 
 pub fn spawnSyncEventLoop(this: *RareData, vm: *jsc.VirtualMachine) *SpawnSyncEventLoop {
     return this.#spawn_sync_event_loop.get() orelse brk: {