fix: retry video frame capture after 2s on E2EE decryption failure

When text bot captures a frame during active call and gets 8x8 garbage
(E2EE not yet decrypted), retry once after 2s to allow key propagation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bot.py

@@ -1881,6 +1881,32 @@ class Bot:
                             logger.info("Captured %dx%d frame from active call for text query", rgba.width, rgba.height)
                         else:
                             logger.warning("Frame too small (%dx%d) — E2EE video decryption likely failed", rgba.width, rgba.height)
+                            # Retry once after 2s — E2EE key may still be propagating
+                            await asyncio.sleep(2)
+                            try:
+                                stream2 = rtc.VideoStream(vs._video_track)
+                                frame2 = None
+                                async for f2 in stream2:
+                                    frame2 = f2
+                                    break
+                                try:
+                                    await stream2.aclose()
+                                except Exception:
+                                    pass
+                                if frame2:
+                                    vf2 = getattr(frame2, 'frame', frame2)
+                                    rgba2 = vf2.convert(rtc.VideoBufferType.RGBA)
+                                    if rgba2.width >= 64 and rgba2.height >= 64:
+                                        img2 = Image.frombytes("RGBA", (rgba2.width, rgba2.height), bytes(rgba2.data))
+                                        buf2 = io.BytesIO()
+                                        img2.convert("RGB").save(buf2, format="JPEG", quality=85)
+                                        img_b64 = base64.b64encode(buf2.getvalue()).decode()
+                                        image_data = (img_b64, "image/jpeg")
+                                        logger.info("Retry captured %dx%d frame from call", rgba2.width, rgba2.height)
+                                    else:
+                                        logger.warning("Retry still too small (%dx%d)", rgba2.width, rgba2.height)
+                            except Exception as exc2:
+                                logger.warning("Frame retry failed: %s", exc2)
                 except Exception as exc:
                     logger.warning("Failed to capture frame from call: %s", exc)