Add text parameter type; verify commands run in the owning repo root

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 295952@bnt-lap001
Assistant-Session: e93f64ad-516c-46eb-9666-aad8d300c477

rtut/run.py

@@ -154,7 +154,7 @@ def verify(run: Run, step_id: str, confirm: bool = False, manual_ok: bool | None
         t0 = time.monotonic()
         try:
             cp = subprocess.run(cmd, shell=True, capture_output=True, text=True,
-                                timeout=VERIFY_TIMEOUT)
+                                timeout=VERIFY_TIMEOUT, cwd=repo_root(run.pack))
             code, out = cp.returncode, cp.stdout + cp.stderr
         except subprocess.TimeoutExpired:
             code, out = -1, ""