add http.cm and probe

source/pit_internal.h

@@ -859,6 +859,14 @@ typedef struct letter {
   };
 } letter;
 
+/* I/O watch entry — one per watched file descriptor */
+typedef struct {
+  int fd;
+  short events;       /* POLLIN, POLLOUT */
+  JSContext *actor;
+  JSValue callback;
+} io_watch;
+
 /* Actor state machine constants */
 #define ACTOR_IDLE        0
 #define ACTOR_READY       1
@@ -1049,6 +1057,10 @@ void enqueue_actor_priority(JSContext *actor);
 void actor_clock(JSContext *actor, JSValue fn);
 uint32_t actor_delay(JSContext *actor, JSValue fn, double seconds);
 JSValue actor_remove_timer(JSContext *actor, uint32_t timer_id);
+void actor_watch(JSContext *actor, int fd, short events, JSValue fn);
+void actor_watch_readable(JSContext *actor, int fd, JSValue fn);
+void actor_watch_writable(JSContext *actor, int fd, JSValue fn);
+void actor_unwatch(JSContext *actor, int fd);
 void exit_handler(void);
 void actor_loop(void);
 void actor_initialize(void);