v2.2.2: fix UI hang on plugin install — bootstrap off main queue

Symptom: installing v2.2.1 caused Mio Island to freeze ("卡崩") on launch.
Not a true crash, just the main runloop stuck long enough to trip the
"app not responding" state.

Root cause: MediaRemoteAdapterSource.spawn() scheduled bootstrapGet()
on `DispatchQueue.main.asyncAfter(+0.3)`. bootstrapGet runs a Perl
subprocess that dlopens MediaRemoteAdapter.framework then calls
`get` — that cold path takes 500ms to 1s in the worst case. During
that entire window, `proc.waitUntilExit()` blocks the main thread.
No UI events drain, SwiftUI drops frames, window looks hung.

Fix:
- Move the `DispatchQueue.main.asyncAfter` to
  `DispatchQueue.global(qos: .userInitiated).asyncAfter` so the Perl
  cold path runs on a background queue.
- Since `currentInfo` is now mutated from both queues (bg in bootstrap,
  main in parseLine/stream), hop the merge + onUpdate back onto main
  after we parse the JSON on bg. Single writer, no data race.
- parseLine is unchanged — still runs on main via the FileHandle
  readabilityHandler hop.

Verified 30s alive, debug log shows bootstrap + stream rx both
emitting correctly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Info.plist

@@ -15,9 +15,9 @@
     <key>CFBundlePackageType</key>
     <string>BNDL</string>
     <key>CFBundleShortVersionString</key>
-    <string>2.2.1</string>
+    <string>2.2.2</string>
     <key>CFBundleVersion</key>
-    <string>10</string>
+    <string>11</string>
     <key>NSPrincipalClass</key>
     <string>MusicPlugin.MusicPlugin</string>
     <!--

Sources/sources/MediaRemoteAdapterSource.swift

@@ -211,7 +211,12 @@ final class MediaRemoteAdapterSource {
             // was opened; in that case the initial stream emit is null/empty,
             // and no diff comes until something changes. A parallel `get`
             // catches whatever is playing right now.
-            DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) { [weak self] in
+            //
+            // CRITICAL: runs on a BACKGROUND queue because bootstrapGet()
+            // calls Process.waitUntilExit() which blocks synchronously for
+            // 500ms-1s (Perl boot + framework load). Running that on main
+            // freezes the whole UI — looked like a crash/hang on launch.
+            DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: .now() + 0.3) { [weak self] in
                 self?.bootstrapGet()
             }
         } catch {
@@ -220,6 +225,9 @@ final class MediaRemoteAdapterSource {
         }
     }
 
+    /// Runs on a BACKGROUND queue. Parses JSON on bg, hops to main for
+    /// the merge + onUpdate so `currentInfo` is only ever mutated on the
+    /// main queue (same queue as stream's parseLine).
     private func bootstrapGet() {
         let proc = Process()
         proc.executableURL = URL(fileURLWithPath: "/usr/bin/perl")
@@ -236,18 +244,20 @@ final class MediaRemoteAdapterSource {
                 debugLog("bootstrap get returned empty")
                 return
             }
-            // `get` emits one JSON object to stdout.
-            if let payload = try? JSONDecoder().decode(AdapterStreamPayload.self, from: data) {
-                merge(payload)
-                debugLog("bootstrap get · title=\(currentInfo.title) playing=\(currentInfo.isPlaying)")
-                if currentInfo.hasTrack {
+            guard let payload = try? JSONDecoder().decode(AdapterStreamPayload.self, from: data) else {
+                debugLog("bootstrap get · parse failed")
+                return
+            }
             DispatchQueue.main.async { [weak self] in
                 guard let self else { return }
+                self.merge(payload)
+                self.debugLog("bootstrap get · title=\(self.currentInfo.title) playing=\(self.currentInfo.isPlaying)")
+                if self.currentInfo.hasTrack {
                     self.onUpdate?(self.currentInfo)
                 }
             }
-            }
         } catch {
+            // debugLog runs main-ok from any queue, just logs.
             debugLog("bootstrap get failed: \(error)")
         }
     }