fix(cron): prepend Nix profile to PATH so tea and claude are found

Cron runs with a minimal environment that doesn't include ~/.nix-profile/bin,
causing every invocation to crash with FileNotFoundError on 'tea'.

Closes #93

scripts/agent_loop.py

@@ -26,6 +26,9 @@ import sys
 from datetime import datetime, timezone
 from pathlib import Path
 
+# Cron runs with a minimal PATH; ensure Nix profile binaries (tea, claude) are found.
+os.environ["PATH"] = f"/home/si/.nix-profile/bin:{os.environ.get('PATH', '/usr/bin:/bin')}"
+
 # ── configuration ─────────────────────────────────────────────────────────────
 
 REPO = "guettli/sharedinbox"