first commit

tests/test_merge.py

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+from app.merge import filter_activity_source, merge_activity
+
+
+def test_merge_activity_combines_totals() -> None:
+    github = {"2026-01-01": 2, "2026-01-02": 1}
+    gitea = {"2026-01-02": 3, "2026-01-03": 4}
+
+    merged = merge_activity(github, gitea)
+
+    assert merged["2026-01-01"] == {"github": 2, "gitea": 0, "total": 2}
+    assert merged["2026-01-02"] == {"github": 1, "gitea": 3, "total": 4}
+    assert merged["2026-01-03"] == {"github": 0, "gitea": 4, "total": 4}
+
+
+def test_filter_activity_source_github_only() -> None:
+    merged = {
+        "2026-01-01": {"github": 2, "gitea": 7, "total": 9},
+    }
+
+    filtered = filter_activity_source(merged, "github")
+
+    assert filtered["2026-01-01"] == {"github": 2, "gitea": 0, "total": 2}