fix(security): redact articulation failure logs

CHANGELOG.md

@@ -7,6 +7,10 @@
 - Display the analyzed song tempo (BPM) as a badge in the rehearsal workspace.
 - 각 합주 역할(Role)별 개인 연습 진행도를 0~100% 범위로 기록 및 시각화할 수 있는 연습 진척도(`practiceProgress`) 트래커 기능 추가. UI 컨트롤(슬라이더 및 +/- 버튼)과 한/영 다국어 지원 포함.
 
+### Fixed
+
+- Redacted dependency-controlled exception messages and tracebacks from routine articulation-analysis failure logs while retaining the operation and exception class for bounded diagnostics.
+
 ## [0.1.3] - 2026-04-29
 
 ### Fixed

services/analysis-engine/src/bandscope_analysis/roles/articulation.py

@@ -18,6 +18,9 @@
 - All computations are bounded by the input array sizes.
 - Fails safe: invalid, empty, or silent audio yields a neutral "mixed"
   result with zeroed metrics, and no exceptions escape the public API.
+- Unexpected dependency failures are logged with only the BandScope-owned
+  operation and exception class; dependency messages and tracebacks are not
+  retained in routine logs.
 """
 
 from __future__ import annotations
@@ -138,8 +141,11 @@ def analyze_articulation(
             "onset_density_per_s": round(onset_density, 3),
             "duty_cycle": round(duty_cycle, 3),
         }
-    except Exception:
-        logger.warning("Articulation analysis failed; returning safe default", exc_info=True)
+    except Exception as error:
+        logger.warning(
+            "Articulation analysis failed; returning safe default (%s)",
+            type(error).__name__,
+        )
         return dict(_SAFE_DEFAULT)
 
 

services/analysis-engine/tests/test_articulation.py

@@ -1,5 +1,6 @@
 """Tests for sustained-versus-choppy articulation detection."""
 
+import logging
 from typing import Any
 
 import numpy as np
@@ -99,14 +100,35 @@ def _zero_rms(**_kwargs: Any) -> NDArray[np.float32]:
     assert analyze_articulation(_sine(1.0), SR) == SAFE_DEFAULT
 
 
-def test_internal_failure_returns_safe_default(monkeypatch: pytest.MonkeyPatch) -> None:
-    """No exception escapes: analysis failures return the safe default."""
+def test_internal_failure_returns_payload_safe_default(
+    monkeypatch: pytest.MonkeyPatch,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Unexpected dependency failures stay out of routine articulation logs."""
+    sensitive_detail = "/Users/Alice/private-articulation.wav token=super-secret"
 
     def _boom(**_kwargs: Any) -> NDArray[np.float32]:
-        raise RuntimeError("synthetic failure")
+        raise RuntimeError(sensitive_detail)
 
     monkeypatch.setattr(articulation.librosa.onset, "onset_strength", _boom)
+    caplog.set_level(logging.WARNING, logger=articulation.__name__)
+
     assert analyze_articulation(_sine(1.0), SR) == SAFE_DEFAULT
+    assert "Articulation analysis failed; returning safe default" in caplog.text
+    assert "/Users/Alice" not in caplog.text
+    assert "private-articulation.wav" not in caplog.text
+    assert "super-secret" not in caplog.text
+    matching_records = [
+        record
+        for record in caplog.records
+        if record.name == articulation.__name__
+        and record.getMessage().startswith("Articulation analysis failed; returning safe default")
+    ]
+    assert len(matching_records) == 1
+    assert matching_records[0].getMessage() == (
+        "Articulation analysis failed; returning safe default (RuntimeError)"
+    )
+    assert matching_records[0].exc_info is None
 
 
 def test_empty_stems_dict_returns_empty() -> None: