feat: point the fleet at wss LiveKit room uwh-telhai

Publish and subscribe over wss://livekit.uni-wh.de:7800 and refuse
cleartext ws://. Conference room is uwh-telhai. Includes the uncommitted
encoded H.264 publish path, Rally hairpin, and KMS wall overlay.

tests/test_frame_shm.py

@@ -0,0 +1,23 @@
+from frame_shm import LatestFrameReader, LatestFrameWriter, frame_bytes
+
+
+def test_latest_frame_roundtrip(tmp_path):
+    path = str(tmp_path / "cam-01.i420")
+    w, h = 16, 16
+    n = frame_bytes(w, h)
+    writer = LatestFrameWriter(path, w, h)
+    payload = bytes(range(256)) * (n // 256 + 1)
+    payload = payload[:n]
+    seq = writer.write(payload)
+    assert seq == 1
+    reader = LatestFrameReader(path)
+    got = reader.latest()
+    assert got is not None
+    assert got[0] == 1
+    assert got[1] == payload
+    seq2 = writer.write(bytes([3]) * n)
+    got2 = reader.latest()
+    assert got2 is not None
+    assert got2[0] == seq2
+    assert got2[1][0] == 3
+    writer.close()