Update configuration and documentation for LLM support and local watchdog

- Added `ollama-models.yaml` to .gitignore and implemented logic to copy it in gpu-rent.ps1 and gpu-rent.sh.
- Enhanced env.example to include new variables for LLM runtime options and local watchdog configuration.
- Updated CLI commands to support LLM options during setup and execution, including new flags for Ollama and llama.cpp.
- Improved documentation in cli.md and README.md to reflect changes in LLM integration and local watchdog functionality.
- Adjusted architecture and decisions documentation to clarify the role of LLMs and local watchdog in the system.

tests/test_local_watchdog.py

@@ -0,0 +1,87 @@
+from datetime import datetime, timedelta, timezone
+
+from gpu_rent.local_watchdog import LocalLease, decide_local_tick
+
+
+def _now() -> datetime:
+    return datetime(2026, 8, 21, 12, 0, tzinfo=timezone.utc)
+
+
+def test_noop_when_not_installed():
+    d = decide_local_tick(
+        installed=False,
+        has_server=True,
+        lease=LocalLease(armed=True, heartbeat_at=_now().isoformat()),
+        now=_now(),
+        process_alive=False,
+        grace_sec=600,
+    )
+    assert d.kind == "noop"
+
+
+def test_noop_when_detached():
+    d = decide_local_tick(
+        installed=True,
+        has_server=True,
+        lease=LocalLease(armed=False, detached=True, heartbeat_at=_now().isoformat()),
+        now=_now(),
+        process_alive=False,
+        grace_sec=600,
+    )
+    assert d.kind == "noop"
+    assert "detached" in d.detail
+
+
+def test_noop_while_pid_alive():
+    d = decide_local_tick(
+        installed=True,
+        has_server=True,
+        lease=LocalLease(
+            armed=True,
+            pid=1,
+            heartbeat_at=(_now() - timedelta(hours=1)).isoformat(),
+        ),
+        now=_now(),
+        process_alive=True,
+        grace_sec=600,
+    )
+    assert d.kind == "noop"
+
+
+def test_noop_inside_grace():
+    hb = _now() - timedelta(minutes=5)
+    d = decide_local_tick(
+        installed=True,
+        has_server=True,
+        lease=LocalLease(armed=True, pid=999, heartbeat_at=hb.isoformat()),
+        now=_now(),
+        process_alive=False,
+        grace_sec=600,
+    )
+    assert d.kind == "noop"
+    assert "grace" in d.detail
+
+
+def test_stop_when_stale():
+    hb = _now() - timedelta(minutes=20)
+    d = decide_local_tick(
+        installed=True,
+        has_server=True,
+        lease=LocalLease(armed=True, pid=999, heartbeat_at=hb.isoformat()),
+        now=_now(),
+        process_alive=False,
+        grace_sec=600,
+    )
+    assert d.kind == "stop"
+
+
+def test_noop_without_lease():
+    d = decide_local_tick(
+        installed=True,
+        has_server=True,
+        lease=None,
+        now=_now(),
+        process_alive=False,
+        grace_sec=600,
+    )
+    assert d.kind == "noop"