Implement Galileo E1B I/NAV navigation decoding

tests/integration/test_multisat_navigation_collection.py

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+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+
+
+@pytest.mark.signalsim
+def test_four_satellites_are_navigation_ready_without_truth_inputs() -> None:
+    path = Path("reports/navigation_run/inav_collection_report.json")
+    if not path.is_file():
+        pytest.skip("SignalSim multi-satellite navigation collection report is unavailable")
+    report = json.loads(path.read_text(encoding="utf-8"))
+    assert report["decoder_truth_inputs"] == []
+    ready = [
+        item for item in report["satellites"].values()
+        if item["complete_ephemeris"] and item["clock_parameters"] and item["health_valid"] and item["data_valid"]
+    ]
+    assert len(ready) >= 4
+    assert report["galileo_time"]["valid"] is True
+    assert report["navigation_ready"] is True