workout generator audit: rules engine, structure rules, split patterns, injury UX, metadata cleanup

- Add rules_engine.py with quantitative rules for all 8 workout types
- Add quality gate retry loop in generate_single_workout()
- Expand calibrate_structure_rules to all 120 combinations (8 types × 5 goals × 3 sections)
- Wire WeeklySplitPattern DB records into _pick_weekly_split()
- Enforce movement patterns from WorkoutStructureRule in exercise selection
- Add straight-set strength support (single main lift, 4-6 rounds)
- Add modality consistency check for duration-dominant workout types
- Add InjuryStep component to onboarding and preferences
- Add sibling exercise exclusion in regenerate and preview_day endpoints
- Display generator warnings on dashboard
- Expand fix_rep_durations, fix_exercise_flags, fix_movement_pattern_typo
- Add audit_exercise_data and check_rules_drift management commands
- Add Next.js frontend with dashboard, onboarding, preferences, history pages
- Add generator app with ML-powered workout generation pipeline
- 96 new tests across 7 test modules

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

werkout-frontend/components/workout/VideoPlayer.tsx

@@ -0,0 +1,52 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+import Hls from "hls.js";
+
+interface VideoPlayerProps {
+  src: string;
+  poster?: string;
+}
+
+export function VideoPlayer({ src, poster }: VideoPlayerProps) {
+  const videoRef = useRef<HTMLVideoElement>(null);
+  const hlsRef = useRef<Hls | null>(null);
+
+  useEffect(() => {
+    const video = videoRef.current;
+    if (!video) return;
+
+    const isHLS = src.endsWith(".m3u8");
+
+    if (isHLS) {
+      if (Hls.isSupported()) {
+        const hls = new Hls();
+        hlsRef.current = hls;
+        hls.loadSource(src);
+        hls.attachMedia(video);
+      } else if (video.canPlayType("application/vnd.apple.mpegurl")) {
+        // Native HLS support (Safari)
+        video.src = src;
+      }
+    } else {
+      video.src = src;
+    }
+
+    return () => {
+      if (hlsRef.current) {
+        hlsRef.current.destroy();
+        hlsRef.current = null;
+      }
+    };
+  }, [src]);
+
+  return (
+    <video
+      ref={videoRef}
+      poster={poster}
+      controls
+      playsInline
+      className="w-full rounded-lg bg-zinc-900"
+    />
+  );
+}