fix: remove vestige-agent from workspace (not shipped), improve reasoning chain output

- Removed vestige-agent and vestige-agent-py from workspace members
  (ARC-AGI-3 code, not part of Vestige release — caused CI failure)
- Improved deep_reference reasoning chain: fuller output with arrows on
  supersession reasoning, longer primary finding preview, fallback message
  when no relations found, boosted relation detection for search results
  with high combined_score

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/dashboard/src/lib/components/TimeSlider.svelte

@@ -51,6 +51,7 @@
 	}
 
 	function playLoop() {
+		if (!playing) return;
 		animFrameId = requestAnimationFrame((now) => {
 			const deltaSeconds = (now - lastTime) / 1000;
 			lastTime = now;
@@ -78,6 +79,7 @@
 	}
 
 	onDestroy(() => {
+		playing = false;
 		cancelAnimationFrame(animFrameId);
 	});
 </script>