refactor(artifacts): harmonize Windows to Linux raw-file collection

Windows produced an intermediate C:\CI\output\artifacts.zip that
upload-artifact then re-zipped (zip-in-zip), while Linux deposited raw
files. Make both paths consistent: the build stages raw outputs into a
collect dir; collect zips it only as a transport archive, fetches, and
extracts into the host artifact dir; actions/upload-artifact produces
the single final archive.

- _windows_build: param artifact_zip -> output_dir; stage raw files
  (in-place when source IS the collect dir, else wipe+copy), no
  Compress-Archive; absolute artifact-source resolved.
- _windows_collect: zip guest dir as transport, fetch, extract (mirror
  _linux_collect); guest_path is now the collect directory.
- job.py / build_run CLI: pass output_dir; rename --guest-artifact-zip
  -> --guest-output-dir.
- Tests updated for the raw-file contract.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/python/test_commands_artifacts.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import json
 import tarfile
+import zipfile
 from pathlib import Path
 from typing import Any, ClassVar
 
@@ -78,8 +79,34 @@ def _patch(monkeypatch: pytest.MonkeyPatch) -> None:
 # ── Windows happy path ────────────────────────────────────────────────────
 
 
+def _zip_payload(tmp_path: Path) -> bytes:
+    """Build a real zip whose contents the fake transport will 'fetch'."""
+    src = tmp_path / "zsrc"
+    src.mkdir()
+    (src / "binary.bin").write_bytes(b"\x01\x02\x03")
+    (src / "log.txt").write_text("hello", encoding="utf-8")
+    zip_local = tmp_path / "transfer.zip"
+    with zipfile.ZipFile(zip_local, "w") as zf:
+        for f in src.iterdir():
+            zf.write(f, arcname=f.name)
+    return zip_local.read_bytes()
+
+
+def _win_transport_with_zip(payload: bytes) -> type:
+    class _WinTransport(_FakeTransport):
+        def fetch(self, remote_path: str, local_path: str) -> None:
+            self.fetched.append((remote_path, str(local_path)))
+            Path(local_path).write_bytes(payload)
+
+    return _WinTransport
+
+
 def test_collect_windows_happy_path(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> None:
     _patch(monkeypatch)
+    payload = _zip_payload(tmp_path)
+    monkeypatch.setattr(
+        artifacts_module, "WinRmTransport", _win_transport_with_zip(payload)
+    )
     out_dir = tmp_path / "artifacts"
     result = CliRunner().invoke(
         cli,
@@ -89,18 +116,19 @@ def test_collect_windows_happy_path(monkeypatch: pytest.MonkeyPatch, tmp_path: P
             "--ip-address",
             "10.0.0.7",
             "--guest-artifact-path",
-            "C:\\CI\\output\\artifacts.zip",
+            "C:\\CI\\output",
             "--host-artifact-dir",
             str(out_dir),
         ],
     )
     assert result.exit_code == 0, result.output
-    assert (out_dir / "artifacts.zip").is_file()
-    instance = _FakeTransport.instances[0]
-    assert any("Test-Path" in c for c in instance.runs)
-    assert instance.fetched == [
-        ("C:\\CI\\output\\artifacts.zip", str(out_dir / "artifacts.zip"))
-    ]
+    # Raw files extracted into host_dir (no zip-in-zip).
+    assert (out_dir / "binary.bin").read_bytes() == b"\x01\x02\x03"
+    assert (out_dir / "log.txt").read_text(encoding="utf-8") == "hello"
+    cmds = _FakeTransport.instances[0].runs
+    assert any("Compress-Archive" in c for c in cmds)
+    # Temp transport zip on the guest is cleaned up.
+    assert any("Remove-Item" in c and "ci-artifacts-transfer.zip" in c for c in cmds)
 
 
 def test_collect_windows_artifact_missing(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> None:
@@ -109,7 +137,9 @@ def test_collect_windows_artifact_missing(monkeypatch: pytest.MonkeyPatch, tmp_p
     class _Missing(_FakeTransport):
         def __init__(self, *a: Any, **kw: Any) -> None:
             super().__init__(*a, **kw)
-            self.run_overrides["Test-Path"] = _FakeResult(stdout="MISSING\r\n")
+            self.run_overrides["-and (Get-ChildItem"] = _FakeResult(
+                stdout="MISSING\r\n"
+            )
 
     monkeypatch.setattr(artifacts_module, "WinRmTransport", _Missing)
     result = CliRunner().invoke(
@@ -120,22 +150,23 @@ def test_collect_windows_artifact_missing(monkeypatch: pytest.MonkeyPatch, tmp_p
             "--ip-address",
             "10.0.0.7",
             "--guest-artifact-path",
-            "C:\\CI\\output\\artifacts.zip",
+            "C:\\CI\\output",
             "--host-artifact-dir",
             str(tmp_path / "out"),
         ],
     )
     assert result.exit_code != 0
-    assert "artifact not found" in result.output
+    assert "artifact not found or empty" in result.output
 
 
 def test_collect_windows_include_logs(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> None:
     _patch(monkeypatch)
+    payload = _zip_payload(tmp_path)
 
-    class _WithLogs(_FakeTransport):
+    class _WithLogs(_win_transport_with_zip(payload)):  # type: ignore[misc]
         def __init__(self, *a: Any, **kw: Any) -> None:
             super().__init__(*a, **kw)
-            self.run_overrides["Get-ChildItem"] = _FakeResult(
+            self.run_overrides["C:\\CI\\build"] = _FakeResult(
                 stdout="C:\\CI\\build\\one.log\r\nC:\\CI\\build\\sub\\two.log\r\n"
             )
 
@@ -148,7 +179,7 @@ def test_collect_windows_include_logs(monkeypatch: pytest.MonkeyPatch, tmp_path:
             "--ip-address",
             "10.0.0.7",
             "--guest-artifact-path",
-            "C:\\CI\\output\\artifacts.zip",
+            "C:\\CI\\output",
             "--host-artifact-dir",
             str(tmp_path / "out"),
             "--include-logs",
@@ -164,6 +195,10 @@ def test_collect_writes_manifest_when_job_id_set(
     monkeypatch: pytest.MonkeyPatch, tmp_path: Path
 ) -> None:
     _patch(monkeypatch)
+    payload = _zip_payload(tmp_path)
+    monkeypatch.setattr(
+        artifacts_module, "WinRmTransport", _win_transport_with_zip(payload)
+    )
     out = tmp_path / "out"
     result = CliRunner().invoke(
         cli,
@@ -173,7 +208,7 @@ def test_collect_writes_manifest_when_job_id_set(
             "--ip-address",
             "10.0.0.7",
             "--guest-artifact-path",
-            "C:\\CI\\output\\artifacts.zip",
+            "C:\\CI\\output",
             "--host-artifact-dir",
             str(out),
             "--job-id",
@@ -189,7 +224,7 @@ def test_collect_writes_manifest_when_job_id_set(
     assert data["jobId"] == "run-42"
     assert data["commit"] == "abc1234"
     names = [f["name"] for f in data["files"]]
-    assert "artifacts.zip" in names
+    assert "binary.bin" in names and "log.txt" in names
 
 
 # ── Linux happy path ──────────────────────────────────────────────────────