feat: add GET /api/stats and GET /api/stats/download endpoints

app/api.py

@@ -245,6 +245,34 @@ def post_config(payload: ConfigPayload):
     return {"ok": True}
 
 
+@app.get("/api/stats")
+def get_stats():
+    records = _read_jsonl(_score_file())
+    counts: dict[str, int] = {}
+    for r in records:
+        lbl = r.get("label", "")
+        if lbl:
+            counts[lbl] = counts.get(lbl, 0) + 1
+    return {
+        "total": len(records),
+        "counts": counts,
+        "score_file_bytes": _score_file().stat().st_size if _score_file().exists() else 0,
+    }
+
+
+@app.get("/api/stats/download")
+def download_stats():
+    from fastapi.responses import FileResponse
+    if not _score_file().exists():
+        raise HTTPException(404, "No score file")
+    return FileResponse(
+        str(_score_file()),
+        filename="email_score.jsonl",
+        media_type="application/jsonlines",
+        headers={"Content-Disposition": 'attachment; filename="email_score.jsonl"'},
+    )
+
+
 # Static SPA — MUST be last (catches all unmatched paths)
 _DIST = _ROOT / "web" / "dist"
 if _DIST.exists():

tests/test_api.py

@@ -207,3 +207,47 @@ def test_get_config_round_trips(client, config_dir):
     data = r.json()
     assert data["max_per_account"] == 300
     assert data["accounts"][0]["name"] == "R"
+
+
+# ── /api/stats ───────────────────────────────────────────────────────────────
+
+@pytest.fixture
+def score_with_labels(tmp_path, data_dir):
+    """Write a score file with 3 labels for stats tests."""
+    score_path = data_dir / "email_score.jsonl"
+    records = [
+        {"id": "a", "label": "interview_scheduled"},
+        {"id": "b", "label": "interview_scheduled"},
+        {"id": "c", "label": "rejected"},
+    ]
+    score_path.write_text("\n".join(json.dumps(r) for r in records) + "\n")
+    return records
+
+
+def test_stats_returns_counts(client, score_with_labels):
+    r = client.get("/api/stats")
+    assert r.status_code == 200
+    data = r.json()
+    assert data["total"] == 3
+    assert data["counts"]["interview_scheduled"] == 2
+    assert data["counts"]["rejected"] == 1
+
+
+def test_stats_empty_when_no_file(client, data_dir):
+    r = client.get("/api/stats")
+    assert r.status_code == 200
+    data = r.json()
+    assert data["total"] == 0
+    assert data["counts"] == {}
+    assert data["score_file_bytes"] == 0
+
+
+def test_stats_download_returns_file(client, score_with_labels):
+    r = client.get("/api/stats/download")
+    assert r.status_code == 200
+    assert "jsonlines" in r.headers.get("content-type", "")
+
+
+def test_stats_download_404_when_no_file(client, data_dir):
+    r = client.get("/api/stats/download")
+    assert r.status_code == 404