daemon: read CLAWDEX_SCALE env var to override window scale

README.md

@@ -61,6 +61,26 @@ Already have your own atlas? Drag-drop the `pet.json` + `spritesheet.webp` pair
 
 The bundled `skill/hatch-pet/` is the format reference + atlas validator (`validate_atlas.py`). It does not generate sprite images itself — bring your own image-gen tool (MidJourney, DALL-E, hand-drawn pixel art) and use the per-row prompts in [`SKILL.md`](skill/hatch-pet/SKILL.md).
 
+## Customization
+
+The default scale is `0.75`, which suits most screens. Override it with the `CLAWDEX_SCALE` env var (read once at daemon startup, clamped to `0.25`–`4.0`):
+
+- `0.5` → pixel-perfect on Retina (1 source px = 1 native px)
+- `0.75` → default
+- `1.0` → 2× pixel-doubled, still crisp via nearest-neighbor
+
+To make it stick across reboots, set it in the launchd plist `~/Library/LaunchAgents/dev.clawdex.daemon.plist`:
+
+```xml
+<key>EnvironmentVariables</key>
+<dict>
+  <key>CLAWDEX_SCALE</key>
+  <string>0.5</string>
+</dict>
+```
+
+Then reload: `launchctl kickstart -k gui/$(id -u)/dev.clawdex.daemon`.
+
 ## How it works
 
 ```

Sources/ClawdexApp/main.swift

@@ -17,7 +17,15 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         // a single binary without an Info.plist app bundle.
         NSApp.setActivationPolicy(.accessory)
 
-        window = PetWindow()
+        // Optional CLAWDEX_SCALE env var lets users override the on-screen size
+        // without rebuilding. Clamped to a sensible range so a typo can't
+        // produce a window larger than the screen or smaller than a pixel.
+        let scale: CGFloat = {
+            guard let raw = ProcessInfo.processInfo.environment["CLAWDEX_SCALE"],
+                  let value = Double(raw), value.isFinite else { return 0.75 }
+            return CGFloat(min(max(value, 0.25), 4.0))
+        }()
+        window = PetWindow(scale: scale)
 
         // Pick first available pet. If user prefers a specific one, ClawdexCLI
         // can send a "select" event over the socket later.