fix(android): don't letterbox against the configure placeholder

H264Decoder.outputSize() reported the 320x240 configure() placeholder
until the codec parsed the in-band SPS, so fitVideo sized the view to
1488x1116 (1.33 aspect) and the first rendered frame(s) of 2.4 content
were visibly squished before the real size corrected it ~40ms later.
Report no size until INFO_OUTPUT_FORMAT_CHANGED delivers the real one:
the first frame renders into the fullscreen surface and the correct
letterbox follows immediately. Validated live on the Fairphone 6 (the
placeholder 'video size' line is gone from logcat; 25/25 JVM tests).

.agents/MEMORY.md

@@ -330,6 +330,18 @@ list the phone at 192.168.178.29:5005; a 25s `--send --target monitor
 Note: with both the Pi and the phone on the LAN, plain `--send` refuses
 (two receivers found) — target the phone with `--peer`.
 
+Follow-up from the same on-device session — startup squish eliminated:
+`H264Decoder.outputSize()` previously reported the 320x240 configure()
+placeholder until the codec parsed the SPS, so `fitVideo` sized the
+TextureView 1488x1116 (1.33 aspect) and the first rendered frame(s) of
+2.4 content were visibly squished. It now returns null until
+`INFO_OUTPUT_FORMAT_CHANGED` fires; the first frame renders into the
+fullscreen surface and the correct letterbox (2484x1035) follows within
+~40ms. Validated live: no placeholder "video size" line in logcat.
+
+Commits: 9a24933 (PROTOCOL_DNS_SD discovery fix + docs), plus the
+outputSize fix (see git log).
+
 Still open (accepted, needs a device or a new test dep):
 
 - Untested on device: `setOutputSurface` mid-session (surface switch) and