Louder master via makeup gain + look-ahead limiter (v0.8.0)

The master stage was a flat 0.5x attenuation into a static tanh soft-clip,
leaving ~9 dB of unused headroom: even the loudest single preset with its mix
bus maxed peaked around -7 dBFS, well below other media playback.

Replace it with a generous makeup gain (1.5x, ~+9.5 dB) feeding a feed-forward,
look-ahead brickwall limiter. A short delay line lets the peak detector pull the
gain down before a loud sample reaches the output and hold it across the
look-ahead window, so the output is mathematically guaranteed to stay under the
ceiling (0.97) - loudness without clipping, and none of the tanh grit a static
clipper adds to a hot single voice. Allocation-free (results go to scratch
fields, not a Pair) and NaN-guarded.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/build.gradle.kts

@@ -22,8 +22,8 @@ android {
         // (android.media.midi) and AAudio low-latency audio we rely on.
         minSdk = 26
         targetSdk = 34
-        versionCode = 22
-        versionName = "0.7.3"
+        versionCode = 23
+        versionName = "0.8.0"
 
         // We provide our own instrumentation runner if/when tests are added.
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"