fix: filter tracing to INFO for wzp crates, WARN for jni crate

The jni crate emits VERBOSE logs for every JNI method lookup (~10 lines
per call, 100+ calls/sec on audio threads). This floods logcat, consumes
CPU, and triggers system kills. Filter to only show INFO+ for our crates
and WARN+ for everything else.

Also fix build script: clean full Rust target to ensure libc++_shared.so
is always copied by cargo-ndk.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/wzp-android/Cargo.toml

@@ -17,7 +17,7 @@ wzp-crypto = { workspace = true }
 wzp-transport = { workspace = true }
 tokio = { workspace = true }
 tracing = { workspace = true }
-tracing-subscriber = { workspace = true }
+tracing-subscriber = { workspace = true, features = ["env-filter"] }
 bytes = { workspace = true }
 serde = { workspace = true }
 serde_json = "1"

crates/wzp-android/src/jni_bridge.rs

@@ -41,8 +41,17 @@ fn init_logging() {
         let _ = std::panic::catch_unwind(|| {
             use tracing_subscriber::layer::SubscriberExt;
             use tracing_subscriber::util::SubscriberInitExt;
+            use tracing_subscriber::EnvFilter;
             if let Ok(layer) = tracing_android::layer("wzp_android") {
-                let _ = tracing_subscriber::registry().with(layer).try_init();
+                // Filter: INFO for our crates, WARN for everything else.
+                // The jni crate emits VERBOSE logs for every method lookup
+                // (~10 lines per JNI call, 100+ calls/sec) which floods logcat
+                // and causes the system to kill the app.
+                let filter = EnvFilter::new("warn,wzp_android=info,wzp_proto=info,wzp_transport=info,wzp_codec=info,wzp_fec=info,wzp_crypto=info");
+                let _ = tracing_subscriber::registry()
+                    .with(layer)
+                    .with(filter)
+                    .try_init();
             }
         });
     });

scripts/build-android-cloud.sh

@@ -196,6 +196,12 @@ do_upload() {
 do_build() {
   log "Building Rust native library (arm64-v8a, release)..."
 
+  # Clean Rust release target to force full rebuild.
+  # cargo-ndk only copies libc++_shared.so when it actually links — a partial
+  # clean that skips relinking leaves libc++_shared.so missing from jniLibs.
+  ssh_cmd "rm -rf /root/wzp-build/target/aarch64-linux-android/release \
+    /root/wzp-build/android/app/src/main/jniLibs/arm64-v8a"
+
   # ANDROID_NDK must be set (not just ANDROID_NDK_HOME) — cmake checks it
   ssh_cmd "source \$HOME/.cargo/env && \
     export ANDROID_HOME=\$HOME/android-sdk && \