feat(figment): integrate figment overlay into scroll loop

Wire render_figment_overlay() into stream() between the effects chain
and the ntfy message overlay, with optional cairosvg import guard.

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

engine/scroll.py

@@ -19,6 +19,7 @@ from engine.layers import (
     apply_glitch,
     process_effects,
     render_firehose,
+    render_figment_overlay,
     render_message_overlay,
     render_ticker_zone,
 )
@@ -53,6 +54,16 @@ def stream(items, ntfy_poller, mic_monitor, display: Display | None = None):
     msg_cache = (None, None)
     frame_number = 0
 
+    # Figment overlay (optional — requires cairosvg)
+    try:
+        from effects_plugins.figment import FigmentEffect
+        from engine.effects.registry import get_registry
+
+        _fg_plugin = get_registry().get("figment")
+        figment = _fg_plugin if isinstance(_fg_plugin, FigmentEffect) else None
+    except ImportError:
+        figment = None
+
     while True:
         if queued >= config.HEADLINE_LIMIT and not active:
             break
@@ -123,6 +134,13 @@ def stream(items, ntfy_poller, mic_monitor, display: Display | None = None):
             firehose_buf = render_firehose(items, w, fh, h)
             buf.extend(firehose_buf)
 
+        # Figment overlay (between effects and ntfy message)
+        if figment and figment.config.enabled:
+            figment_state = figment.get_figment_state(frame_number, w, h)
+            if figment_state is not None:
+                figment_buf = render_figment_overlay(figment_state, w, h)
+                buf.extend(figment_buf)
+
         if msg_overlay:
             buf.extend(msg_overlay)