Add evidence-near semantic architecture experiments

Record the V1-V3 experiments and accept the minimal semantic-preservation first stage.

scripts/run_semantic_synthesis_experiment.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+"""Repository entry point for the isolated semantic synthesis experiment."""
+
+import sys
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+if str(REPO_ROOT) not in sys.path:
+    sys.path.insert(0, str(REPO_ROOT))
+
+from src.meeting_lab.semantic_synthesis.experiment import main  # noqa: E402
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())