web: DRY Step 5 and alternatives (partial+macro), centralize start_ctx/owned_set, adopt builder_*

code/tests/test_summary_utils.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+from code.web.services.summary_utils import summary_ctx
+
+
+def test_summary_ctx_empty_summary():
+    ctx = summary_ctx(summary=None, commander="Test Commander", tags=["Aggro"])
+    assert isinstance(ctx, dict)
+    assert ctx.get("owned_set") is not None
+    assert isinstance(ctx.get("combos"), list)
+    assert isinstance(ctx.get("synergies"), list)
+    assert ctx.get("versions") == {}
+    assert ctx.get("commander") == "Test Commander"
+    assert ctx.get("tags") == ["Aggro"]
+
+
+def test_summary_ctx_with_summary_basic():
+    # Minimal fake summary structure sufficient for detect_for_summary to accept
+    summary = {
+        "type_breakdown": {"counts": {}, "order": [], "cards": {}, "total": 0},
+        "pip_distribution": {"counts": {}, "weights": {}},
+        "mana_generation": {},
+        "mana_curve": {"total_spells": 0},
+        "colors": [],
+    }
+    ctx = summary_ctx(summary=summary, commander="Cmdr", tags=["Spells"])
+    assert "owned_set" in ctx and isinstance(ctx["owned_set"], set)
+    assert "game_changers" in ctx
+    assert "combos" in ctx and isinstance(ctx["combos"], list)
+    assert "synergies" in ctx and isinstance(ctx["synergies"], list)
+    assert "versions" in ctx and isinstance(ctx["versions"], dict)