feat: Phase 2.6 edges migration to Qdrant (TKG-only architecture)

Phase 2.6.1: co_occurrence_edges migration
- build_co_occurrence_edges_from_qdrant()
- Qdrant embeddings → frame grouping → YOLO objects
- Result: 6679 edges (vs 6701 PostgreSQL)

Phase 2.6.2: face_face_edges migration
- build_face_face_edges_from_qdrant()
- Qdrant embeddings → frame grouping → face pairs
- mutual_gaze detection preserved
- Result: 6 edges (exact match)

Phase 2.6.3: speaker_face_edges migration
- build_speaker_face_edges_from_qdrant()
- Qdrant embeddings → trace_id frame ranges
- SPEAKS_AS edge creation

Architecture:
- All edges use Qdrant payload (no face_detections queries)
- PostgreSQL fallback for empty Qdrant
- Estimated 3.6x performance improvement

Testing:
- Playground (3003): ✓ All Phase 2.6 logs verified
- Edge counts: ✓ Close match with PostgreSQL
- Fallback: ✓ Working

Docs:
- docs_v1.0/DESIGN/TKG_PHASE2_6_EDGES_MIGRATION.md
- docs_v1.0/M4_workspace/2026-06-21_phase2_6_test.md

v1.1/run-server-3003_v1.11.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# Start playground server on port 3003
+# Logs to logs/momentry_3003.log
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+# Kill existing server on port 3003
+PID=$(lsof -ti :3003 2>/dev/null || true)
+if [ -n "$PID" ]; then
+  echo "Killing existing server on port 3003 (PID: $PID)"
+  kill "$PID" 2>/dev/null || true
+  sleep 2
+fi
+
+# Build if needed
+if [ ! -f target/debug/momentry_playground ]; then
+  echo "Building playground binary..."
+  cargo build --bin momentry_playground
+fi
+
+# Start server
+echo "Starting momentry_playground server on port 3003..."
+./target/debug/momentry_playground server --port 3003 > logs/momentry_3003.log 2>&1 &
+echo "Server started (PID: $!)"
+echo "Logs: logs/momentry_3003.log"