Sprint 1 : scaffolding complet de Glibredecision

Plateforme de decisions collectives pour Duniter/G1.
Backend FastAPI async + PostgreSQL (14 tables, 8 routers, 6 services,
moteur de vote avec formule d'inertie WoT/Smith/TechComm).
Frontend Nuxt 4 + Nuxt UI v3 + Pinia (9 pages, 5 stores).
Infrastructure Docker + Woodpecker CI + Traefik.
Documentation technique et utilisateur (15 fichiers).
Seed : Licence G1, Engagement Forgeron v2.0.0, 4 protocoles de vote.
30 tests unitaires (formules, mode params, vote nuance) -- tous verts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/tests/test_mode_params.py

@@ -0,0 +1,75 @@
+"""Tests for mode-params string parser."""
+
+from app.engine.mode_params import parse_mode_params
+
+
+class TestParseModeParams:
+    """Parse compact parameter strings into structured dicts."""
+
+    def test_standard_params(self):
+        """D30M50B.1G.2 => standard Licence G1 params."""
+        result = parse_mode_params("D30M50B.1G.2")
+        assert result["duration_days"] == 30
+        assert result["majority_pct"] == 50
+        assert result["base_exponent"] == 0.1
+        assert result["gradient_exponent"] == 0.2
+        # Optional criteria absent
+        assert result["smith_exponent"] is None
+        assert result["techcomm_exponent"] is None
+
+    def test_with_smith_exponent(self):
+        """D30M50B.1G.2S.1 => standard + smith_exponent=0.1."""
+        result = parse_mode_params("D30M50B.1G.2S.1")
+        assert result["duration_days"] == 30
+        assert result["majority_pct"] == 50
+        assert result["base_exponent"] == 0.1
+        assert result["gradient_exponent"] == 0.2
+        assert result["smith_exponent"] == 0.1
+        assert result["techcomm_exponent"] is None
+
+    def test_with_techcomm_exponent(self):
+        """D30M50B.1G.2T.1 => standard + techcomm_exponent=0.1."""
+        result = parse_mode_params("D30M50B.1G.2T.1")
+        assert result["duration_days"] == 30
+        assert result["majority_pct"] == 50
+        assert result["base_exponent"] == 0.1
+        assert result["gradient_exponent"] == 0.2
+        assert result["smith_exponent"] is None
+        assert result["techcomm_exponent"] == 0.1
+
+    def test_full_params_with_constant(self):
+        """D30M50B1G.5C10 => integer base, gradient=0.5, constant=10."""
+        result = parse_mode_params("D30M50B1G.5C10")
+        assert result["duration_days"] == 30
+        assert result["majority_pct"] == 50
+        assert result["base_exponent"] == 1.0
+        assert result["gradient_exponent"] == 0.5
+        assert result["constant_base"] == 10.0
+
+    def test_empty_string_defaults(self):
+        """Empty string returns all defaults."""
+        result = parse_mode_params("")
+        assert result["duration_days"] == 30
+        assert result["majority_pct"] == 50
+        assert result["base_exponent"] == 0.1
+        assert result["gradient_exponent"] == 0.2
+        assert result["constant_base"] == 0.0
+        assert result["smith_exponent"] is None
+        assert result["techcomm_exponent"] is None
+        assert result["ratio_multiplier"] is None
+        assert result["is_ratio_mode"] is False
+
+    def test_whitespace_only_returns_defaults(self):
+        """Whitespace-only string treated as empty."""
+        result = parse_mode_params("   ")
+        assert result["duration_days"] == 30
+
+    def test_roundtrip_consistency(self):
+        """Parsing a standard string then re-checking all keys."""
+        result = parse_mode_params("D30M50B.1G.2")
+        expected_keys = {
+            "duration_days", "majority_pct", "base_exponent",
+            "gradient_exponent", "constant_base", "smith_exponent",
+            "techcomm_exponent", "ratio_multiplier", "is_ratio_mode",
+        }
+        assert set(result.keys()) == expected_keys