kin: auto-commit after pipeline

agents/runner.py

@@ -11,6 +11,7 @@ import re
 import shlex
 import shutil
 import sqlite3
+import sys
 import subprocess
 import time
 from pathlib import Path
@@ -810,7 +811,7 @@ def _detect_test_command(project_path: str) -> str | None:
 
     # 3. pytest
     if (path / "pyproject.toml").is_file() or (path / "setup.py").is_file():
-        return "pytest"
+        return f"{sys.executable} -m pytest"
 
     # 4. npx tsc --noEmit
     if (path / "tsconfig.json").is_file():
@@ -1313,6 +1314,10 @@ def run_pipeline(
 
     Returns {success, steps_completed, total_cost, total_tokens, total_duration, results}
     """
+    # Guard: empty pipeline — return immediately without touching DB or task state
+    if not steps:
+        return {"success": False, "error": "empty_pipeline"}
+
     # Auth check — skip for dry_run (dry_run never calls claude CLI)
     if not dry_run:
         try: