chore: consolidate all in-progress parallel-session WIP

Wholesale commit of every uncommitted change across the tree, at the user's
explicit request — host refactor-campaign W1 (native.rs facade + native/ dir,
library/ + mgmt/ splits), Android, core. These streams were mid-flight and not
individually built/tested together; this supersedes the per-session HOLD
markers. Consolidating so everything lands on main in one pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

clients/android/native/src/decode.rs

@@ -617,6 +617,19 @@ pub(crate) fn codec_mime(codec: u8) -> &'static str {
     }
 }
 
+/// A short human label for the codec the host resolved, for the stats HUD's video-feed line
+/// (`"H.264"` / `"HEVC"` / `"AV1"` / `"PyroWave"`). Mirrors [`codec_mime`]'s fallback: anything
+/// not H.264/AV1/PyroWave is reported as HEVC (every pre-negotiation host emitted HEVC). Kept
+/// beside [`codec_mime`] because the MIME collapses PyroWave onto `video/hevc` and so can't name it.
+pub(crate) fn codec_label(codec: u8) -> &'static str {
+    match codec {
+        punktfunk_core::quic::CODEC_H264 => "H.264",
+        punktfunk_core::quic::CODEC_AV1 => "AV1",
+        punktfunk_core::quic::CODEC_PYROWAVE => "PyroWave",
+        _ => "HEVC",
+    }
+}
+
 /// Create the decoder: prefer the specific codec Kotlin ranked from `MediaCodecList`
 /// (`from_codec_name`), falling back to the platform's default decoder for the MIME
 /// (`from_decoder_type`) if that name can't be created (codec busy / renamed across an OS update).

clients/android/native/src/session/planes.rs

@@ -102,6 +102,31 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeVideoMime<'
     })
 }
 
+/// `NativeBridge.nativeVideoCodecLabel(handle): String` — a short human label for the codec the
+/// host resolved (`"H.264"` / `"HEVC"` / `"AV1"` / `"PyroWave"`), for the stats HUD's video-feed
+/// line. Distinct from [`Java_io_unom_punktfunk_kit_NativeBridge_nativeVideoMime`] because the MIME
+/// collapses PyroWave onto `video/hevc` and can't name it. Empty string on a `0` handle. Cheap;
+/// safe on the UI thread. Android-gated (reads `crate::decode`), matching `nativeVideoMime`.
+#[cfg(target_os = "android")]
+#[no_mangle]
+pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeVideoCodecLabel<'local>(
+    env: JNIEnv<'local>,
+    _this: JObject<'local>,
+    handle: jlong,
+) -> jstring {
+    jni_guard(std::ptr::null_mut(), || {
+        if handle == 0 {
+            return std::ptr::null_mut();
+        }
+        // SAFETY: live handle per the nativeConnect/nativeClose contract.
+        let h = unsafe { &*(handle as *const SessionHandle) };
+        match env.new_string(crate::decode::codec_label(h.client.codec)) {
+            Ok(s) => s.into_raw(),
+            Err(_) => std::ptr::null_mut(),
+        }
+    })
+}
+
 /// `NativeBridge.nativeVideoDecoderLabel(handle): String` — the resolved decoder identity for the
 /// HUD, e.g. `c2.qti.avc.decoder · low-latency`, or `""` before the decode thread has resolved one.
 /// One-shot (the decoder is fixed for the session); poll once after the HUD appears. Not