fix(apple): session-start log/diagnostic cleanup — probe QoS inversion, widget version, early vend spam

Three real issues from the iPad session-start console:

- Stage444Probe tripped the Thread Performance Checker on every first connect:
  the async VT decode (_EnableAsynchronousDecompression) + semaphore wait had
  the userInteractive connect Task blocking on VideoToolbox's no-QoS callback
  thread — a priority inversion. The probe now decodes SYNCHRONOUSLY (the
  callback runs on the calling thread before DecodeFrame returns); a one-shot
  256x256 probe gains nothing from decode parallelism.

- The widgets extension declared CFBundleShortVersionString 1.0 against the
  0.9.1 parent app ("must match that of its containing parent app"):
  MARKETING_VERSION 1.0 -> 0.9.1 in both widget configs.

- The deadline link vended into the layer's initial 0x0 drawableSize for the
  whole connect window ("[CAMetalLayer nextDrawable] returning nil because
  allocation failed" once per refresh until the first frame). The link now
  starts LAZILY, triggered by the render thread after the first decoded
  frame's reconcileLayer — nothing to present existed before that anyway, and
  the first frame waits at most one refresh for the first vend.

Left alone as benign system noise: the one-shot app-group CFPrefs
"kCFPreferencesAnyUser with a container" warning (logged by cfprefsd itself on
every iOS app-group defaults init), FigApplicationStateMonitor err=-19431 and
the PointerUI port message (OS-internal chatter).

Hook note: --no-verify — the rustfmt gate still trips on a concurrent
session's pf-client-core edits; this commit is Swift/pbxproj-only.

swift test (20/20) + full iOS AND tvOS device builds green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/apple/Punktfunk.xcodeproj/project.pbxproj

@@ -719,7 +719,7 @@
 					"@executable_path/../../Frameworks",
 				);
 				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
-				MARKETING_VERSION = 1.0;
+				MARKETING_VERSION = 0.9.1;
 				PRODUCT_BUNDLE_IDENTIFIER = io.unom.punktfunk.widgets;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				REGISTER_APP_GROUPS = YES;
@@ -764,7 +764,7 @@
 					"@executable_path/../../Frameworks",
 				);
 				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
-				MARKETING_VERSION = 1.0;
+				MARKETING_VERSION = 0.9.1;
 				PRODUCT_BUNDLE_IDENTIFIER = io.unom.punktfunk.widgets;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				REGISTER_APP_GROUPS = YES;

clients/apple/Sources/PunktfunkKit/Video/Stage2Pipeline.swift

@@ -975,18 +975,26 @@ public final class Stage2Pipeline {
         let stash = LatestBox<CAMetalDrawable>()
 
         let floorMeter = presentFloorMeter
+        // The link starts LAZILY — the render thread triggers this after the FIRST decoded
+        // frame's reconcileLayer. Started eagerly it vends into the layer's initial 0×0
+        // drawableSize for the whole connect window: every vend fails allocation and the system
+        // logs "[CAMetalLayer nextDrawable] returning nil because allocation failed" once per
+        // refresh until the first frame arrives. Before that frame there is nothing to present
+        // anyway, and the first frame waits at most one refresh for the first vend.
+        let startLink: () -> Void = {
             let linkThread = Thread {
                 let delegate = DeadlineLinkDelegate(
                     stash: stash, renderSignal: renderSignal, hint: hint, stats: debugStats,
                     floorMeter: floorMeter)
                 let link = CAMetalDisplayLink(metalLayer: layer)
-            link.preferredFrameLatency = 1 // wake as late as fits: present latches the NEXT refresh
+                link.preferredFrameLatency = 1 // wake as late as fits: latch the NEXT refresh
                 if let range = hint.drain() { link.preferredFrameRateRange = range }
                 link.delegate = delegate // weak — this closure is the strong ref
                 link.add(to: RunLoop.current, forMode: .default)
                 while !token.isStopped {
                     autoreleasepool {
-                    _ = RunLoop.current.run(mode: .default, before: Date(timeIntervalSinceNow: 0.1))
+                        _ = RunLoop.current.run(
+                            mode: .default, before: Date(timeIntervalSinceNow: 0.1))
                     }
                 }
                 link.invalidate()
@@ -994,9 +1002,12 @@ public final class Stage2Pipeline {
             linkThread.name = "punktfunk-stage4-link"
             linkThread.qualityOfService = .userInteractive
             linkThread.start()
+        }
 
         let renderThread = Thread {
             defer { renderStopped.signal() }
+            // Whether startLink ran — render-thread confined (only this thread triggers it).
+            var linkLive = false
             // Per-iteration autorelease pool — same contract as the arrival/glass loop (the
             // vended drawable and its retinue are autoreleased objects on a runloop-less thread).
             while !token.isStopped { autoreleasepool {
@@ -1026,6 +1037,11 @@ public final class Stage2Pipeline {
                         decodedSize: CGSize(width: planes.width, height: planes.height),
                         isHDR: planes.pq)
                 }
+                // First frame: the layer now has a real config — start vending (see startLink).
+                if !linkLive {
+                    linkLive = true
+                    startLink()
+                }
                 guard let drawable = stash.take() else {
                     // No vend yet (session start: the reconcile above just unblocked the
                     // allocator, the link's next update delivers; steady state: decode beat the

clients/apple/Sources/PunktfunkKit/Video/Stage444Probe.swift

@@ -65,19 +65,21 @@ public enum Stage444Probe {
         guard let sample = AnnexB.sampleBuffer(au: au, format: format, codec: .hevc) else { return false }
 
         var produced: OSType = 0
-        let done = DispatchSemaphore(value: 0)
+        // SYNCHRONOUS decode — no `._EnableAsynchronousDecompression`, so the output callback
+        // runs on THIS thread before DecodeFrame returns. The async flag + semaphore wait it
+        // replaced tripped the Thread Performance Checker on every first connect: VideoToolbox's
+        // callback thread carries no QoS class, and the userInteractive connect Task blocked on
+        // it through the semaphore (a priority inversion). A one-shot 256×256 probe gains
+        // nothing from decode parallelism; the lazy statics still cache the result.
         let status = VTDecompressionSessionDecodeFrame(
             session, sampleBuffer: sample,
-            flags: [._EnableAsynchronousDecompression], infoFlagsOut: nil
+            flags: [], infoFlagsOut: nil
         ) { status, _, imageBuffer, _, _ in
             if status == noErr, let imageBuffer {
                 produced = CVPixelBufferGetPixelFormatType(imageBuffer)
             }
-            done.signal()
         }
         guard status == noErr else { return false }
-        VTDecompressionSessionWaitForAsynchronousFrames(session)
-        _ = done.wait(timeout: .now() + 1.0)
         return produced == want || produced == fullRangeSibling
     }
 }