debug(quic): log MAX_STREAMS_UNI emission and per-25-stream count milestones

Listener cliff at uni stream #124 with the publisher continuing to
push for ~55 s past that point — the prior MAX_STREAMS_UNI extension
fix is either firing too late or not firing at all on the live
device. The trace can't tell us which because the bump itself is
silent.

- QuicConnectionWriter: log every MAX_STREAMS_UNI / MAX_STREAMS_BIDI
  emission with old→new cap and the current peerInitiated count, so
  we can see whether the writer is bumping the cap at all and how
  far behind reception it falls.
- QuicConnection: log peerInitiatedUniCount every 25 streams along
  with the currently advertised cap and headroom. Cheap and lets us
  correlate "stream count growth" against "cap bumps" without
  printing per-stream noise.

Tag is `NestQuic` so listeners can scope `adb logcat -s NestRx:D
NestTx:D NestQuic:D` to capture the full picture.

https://claude.ai/code/session_01PYYez8a6sjiakyjAxsfCEQ

quic/src/commonMain/kotlin/com/vitorpamplona/quic/connection/QuicConnection.kt

@@ -20,6 +20,7 @@
  */
 package com.vitorpamplona.quic.connection
 
+import com.vitorpamplona.quartz.utils.Log
 import com.vitorpamplona.quic.crypto.AesEcbHeaderProtection
 import com.vitorpamplona.quic.crypto.InitialSecrets
 import com.vitorpamplona.quic.crypto.PlatformAesOneBlock
@@ -635,8 +636,20 @@ class QuicConnection(
         // [config.initialMaxStreams*] is the lifetime maximum the peer
         // can open and any longer broadcast silently truncates.
         when (kind) {
-            StreamId.Kind.SERVER_UNI, StreamId.Kind.CLIENT_UNI -> peerInitiatedUniCount += 1
-            StreamId.Kind.SERVER_BIDI, StreamId.Kind.CLIENT_BIDI -> peerInitiatedBidiCount += 1
+            StreamId.Kind.SERVER_UNI, StreamId.Kind.CLIENT_UNI -> {
+                peerInitiatedUniCount += 1
+                if (peerInitiatedUniCount % 25L == 0L) {
+                    Log.d("NestQuic") {
+                        "peerInitiatedUniCount=$peerInitiatedUniCount " +
+                            "advertisedMaxStreamsUni=$advertisedMaxStreamsUni " +
+                            "(headroom=${advertisedMaxStreamsUni - peerInitiatedUniCount})"
+                    }
+                }
+            }
+
+            StreamId.Kind.SERVER_BIDI, StreamId.Kind.CLIENT_BIDI -> {
+                peerInitiatedBidiCount += 1
+            }
         }
         // Wake any awaitIncomingPeerStream caller. trySend on a CONFLATED
         // channel can never fail in steady state.

quic/src/commonMain/kotlin/com/vitorpamplona/quic/connection/QuicConnectionWriter.kt

@@ -20,6 +20,7 @@
  */
 package com.vitorpamplona.quic.connection
 
+import com.vitorpamplona.quartz.utils.Log
 import com.vitorpamplona.quic.frame.ConnectionCloseFrame
 import com.vitorpamplona.quic.frame.CryptoFrame
 import com.vitorpamplona.quic.frame.DatagramFrame
@@ -395,15 +396,25 @@ private fun appendFlowControlUpdates(
     if (conn.peerInitiatedUniCount + cfg.initialMaxStreamsUni / 2 >= conn.advertisedMaxStreamsUni) {
         val newCap = conn.peerInitiatedUniCount + cfg.initialMaxStreamsUni
         if (newCap > conn.advertisedMaxStreamsUni) {
+            val oldCap = conn.advertisedMaxStreamsUni
             conn.advertisedMaxStreamsUni = newCap
             frames += MaxStreamsFrame(bidi = false, maxStreams = newCap)
+            Log.d("NestQuic") {
+                "MAX_STREAMS_UNI emit oldCap=$oldCap → newCap=$newCap " +
+                    "peerInitiatedUniCount=${conn.peerInitiatedUniCount}"
+            }
         }
     }
     if (conn.peerInitiatedBidiCount + cfg.initialMaxStreamsBidi / 2 >= conn.advertisedMaxStreamsBidi) {
         val newCap = conn.peerInitiatedBidiCount + cfg.initialMaxStreamsBidi
         if (newCap > conn.advertisedMaxStreamsBidi) {
+            val oldCap = conn.advertisedMaxStreamsBidi
             conn.advertisedMaxStreamsBidi = newCap
             frames += MaxStreamsFrame(bidi = true, maxStreams = newCap)
+            Log.d("NestQuic") {
+                "MAX_STREAMS_BIDI emit oldCap=$oldCap → newCap=$newCap " +
+                    "peerInitiatedBidiCount=${conn.peerInitiatedBidiCount}"
+            }
         }
     }
 }