Refactor README and streaming_turn_model.py to clarify fixed-grid frame ownership and update documentation. Remove merge conflict markers and enhance explanations regarding session launching conditions and audio slicing behavior.

streaming_turn_model.py

@@ -243,7 +243,6 @@ class FixedGridAV:
             raise RuntimeError(f"Decoded audio is empty: {self.path}")
 
     def frames(self, start: float, end: float) -> list[Any]:
-<<<<<<< HEAD
         """Return fixed-grid frames whose timestamps lie in ``[start, end)``.
 
         Half-open ownership is essential at native block boundaries. For
@@ -251,23 +250,14 @@ class FixedGridAV:
         not also be committed in ``[0.0, 2.0)``. Audio slicing below follows
         the same convention.
         """
-=======
-        """Return fixed-grid frames whose timestamps lie in [start, end)."""
->>>>>>> 8145be410866dd0675038d92347aea34d24b84d5
 
         import numpy as np
         from PIL import Image
 
         first = max(0, int(math.ceil(start * self.fps - 1e-7)))
-<<<<<<< HEAD
-        last = min(
-            self.num_frames - 1,
-            int(math.ceil(end * self.fps - 1e-7)) - 1,
-=======
         last_exclusive = min(
             self.num_frames,
             int(math.ceil(end * self.fps - 1e-7)),
->>>>>>> 8145be410866dd0675038d92347aea34d24b84d5
         )
         last = last_exclusive - 1
         if first > last: