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_hop_shm.py

@@ -0,0 +1,47 @@
+from hop_shm import HopReader, HopWriter, hop_bytes
+
+
+def test_hop_ring_preserves_order(tmp_path):
+    path = str(tmp_path / "cam-01.pcm")
+    n = hop_bytes(16000, 2, 0.1)
+    w = HopWriter(path, n, nslots=4)
+    r = HopReader(path)
+    for i in range(3):
+        payload = bytes([i]) * n
+        w.write(payload)
+    got = [r.read() for _ in range(3)]
+    assert got[0] is not None and got[0][0] == 0
+    assert got[1] is not None and got[1][0] == 1
+    assert got[2] is not None and got[2][0] == 2
+    assert r.read() is None
+    w.close()
+
+
+def test_hop_ring_skips_when_reader_lags(tmp_path):
+    path = str(tmp_path / "cam-01.pcm")
+    n = 32
+    w = HopWriter(path, n, nslots=4)
+    r = HopReader(path)
+    for i in range(10):
+        w.write(bytes([i]) * n)
+    last = r.read()
+    assert last is not None
+    w.close()
+
+
+def test_reader_follows_writer_restart(tmp_path):
+    """Cameras-only restart zeros seq; the wall must not stay stuck on _last."""
+    path = str(tmp_path / "cam-01.pcm")
+    n = 32
+    w = HopWriter(path, n, nslots=4)
+    r = HopReader(path)
+    for i in range(8):
+        w.write(bytes([i]) * n)
+    assert r.read() is not None
+    w.close()
+    w2 = HopWriter(path, n, nslots=4)
+    w2.write(bytes([99]) * n)
+    got = r.read()
+    assert got is not None and got[0] == 99
+    assert r.read() is None
+    w2.close()