Quality cleanup refactoring

Made-with: Cursor

_docs/04_refactoring/01-quality-cleanup/verification_report.md

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+# Verification Report
+
+**Run**: 01-quality-cleanup
+**Date**: 2026-04-13
+
+## Test Results
+
+| Metric | Value |
+|--------|-------|
+| Total tests | 18 |
+| Passed | 18 |
+| Failed | 0 |
+| Skipped | 0 |
+| Duration | 18.11s |
+
+## Metric Comparison
+
+### Source LOC (same 11 files as baseline)
+
+| File | Baseline | Final | Delta |
+|------|----------|-------|-------|
+| api_client.pyx | 222 | 188 | -34 |
+| main.py | 187 | 199 | +12 |
+| hardware_service.pyx | 100 | 100 | 0 |
+| binary_split.py | 69 | 64 | -5 |
+| security.pyx | 68 | 64 | -4 |
+| cdn_manager.pyx | 44 | 45 | +1 |
+| constants.pyx | 44 | 38 | -6 |
+| setup.py | 27 | 28 | +1 |
+| unlock_state.py | 11 | 12 | +1 |
+| credentials.pyx | 9 | 10 | +1 |
+| user.pyx | 6 | 7 | +1 |
+| **Total** | **785** | **755** | **-30** |
+
+### Summary Metrics
+
+| Metric | Baseline | Final | Delta | Status |
+|--------|----------|-------|-------|--------|
+| Source LOC | 785 | 755 | -30 | Improved |
+| Test LOC | 295 | 369 | +74 | Improved |
+| Tests | 18 | 18 | 0 | Unchanged |
+| Test pass rate | 100% | 100% | 0 | Unchanged |
+| Endpoints | 7 | 7 | 0 | Unchanged |
+| Dead methods | 5 | 0 | -5 | Improved |
+| Dead constants | 5 | 0 | -5 | Improved |
+| Silent error paths | 3 | 0 | -3 | Improved |
+| Manual crypto | 2 | 0 | -2 | Improved |
+| Thread safety issues | 2 | 0 | -2 | Improved |
+
+### Acceptance Criteria
+
+| Criterion | Status | Evidence |
+|-----------|--------|----------|
+| C01: Thread-safe singleton | Met | Double-checked locking in main.py |
+| C02: Encapsulated unlock state | Met | _UnlockStateHolder with internal lock |
+| C03: Library PKCS7 in security.pyx | Met | padding.PKCS7(128).unpadder() replaces manual code |
+| C04: Library PKCS7 in binary_split.py | Met | Streaming unpadder integrated into decrypt pipeline |
+| C05: Configurable log path | Met | LOG_DIR env var with Logs default |
+| C06: Log os.remove failure | Met | logger.warning on OSError |
+| C07: Dead methods removed | Met | 5 methods deleted from api_client.pyx + .pxd |
+| C08: Dead constants removed | Met | 5 constants from .pyx + 7 declarations from .pxd |
+| C09: CDN upload check | Met | Exception raised on cdn_manager.upload() failure |
+| C10: Upload error propagation | Met | try/except removed from upload_file |
+
+## Regressions
+
+None.