fix(inf-parser): tolerate bare-line sections in real vendor INFs

Real INFs (e.g. Ricoh oemsetup.inf) include [SourceDisksFiles] entries
with bare filename lines (no '='), which strict configparser rejects
with ParsingError, surfacing as a 500 on /drivers/upload.

Pre-process the INF text to rewrite bare lines into synthetic
__bare_N = <line> entries before parsing, and filter those synthetic
keys out of DriverDesc extraction so they cannot leak into driver_names.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_inf_parser.py

@@ -279,3 +279,40 @@ def test_empty_models_section():
     """INF with empty Models section returns empty driver_names list."""
     result = parse_inf(EMPTY_MODELS_INF, "empty.inf", [])
     assert result.driver_names == []
+
+
+# ---------------------------------------------------------------------------
+# parse_inf – tolerates bare-line sections (real-world Ricoh oemsetup.inf)
+# ---------------------------------------------------------------------------
+
+BARE_LINE_INF = """\
+[Version]
+Signature="$Windows NT$"
+
+[Manufacturer]
+%MFG%=Models,NTamd64
+
+[Models.NTamd64]
+%RICOH_DRIVER%=Install,{CCCCCCCC-CCCC-CCCC-CCCC-CCCCCCCCCCCC}
+
+[SourceDisksFiles]
+ricu18ui.dll,ricu18ui.dl_
+ricu18ui.irj
+ricu18ui.rdj
+ricu18gl.dll,ricu18gl.dl_
+RD01Kd64.dll,RD01Kd64.dl_,,0x00000020
+
+[Strings]
+MFG="Ricoh"
+RICOH_DRIVER="Ricoh PCL6 Universal"
+"""
+
+
+def test_bare_line_sections_do_not_raise():
+    """Real INFs (e.g. Ricoh oemsetup.inf) include [SourceDisksFiles] entries
+    with bare filename lines and no '=' — parse_inf must not raise and must
+    still extract DriverDesc from the Models section."""
+    result = parse_inf(BARE_LINE_INF, "oemsetup.inf", ["oemsetup.inf"])
+    assert "Ricoh PCL6 Universal" in result.driver_names
+    # Synthetic __bare_N keys must not leak into driver_names
+    assert not any(n.startswith("__bare_") for n in result.driver_names)