fix(dev): raise macOS open-file limit before astro dev to prevent EMFILE

bincio/dev.py

@@ -7,6 +7,8 @@ foreground. One command replaces the two-terminal setup.
 from __future__ import annotations
 
 import os
+import platform
+import resource
 import subprocess
 import sys
 import threading
@@ -233,6 +235,14 @@ def dev(
         "VITE_API_PORT": str(api_port),                 # picked up by astro.config.mjs
     }
 
+    # Astro's file watcher opens many handles; macOS defaults to 256, which
+    # causes EMFILE. Raise the limit before forking so the child inherits it.
+    if platform.system() == "Darwin":
+        target = 65536
+        soft, hard = resource.getrlimit(resource.RLIMIT_NOFILE)
+        if soft < target:
+            resource.setrlimit(resource.RLIMIT_NOFILE, (min(target, hard), hard))
+
     # Start astro dev in foreground (Ctrl+C stops everything)
     console.print(f"Starting [cyan]astro dev[/cyan] on port {port}…")
     console.print()