test: make both suites pass on Windows

Most of these failed on Windows for reasons that had nothing to do with the
code under test, which is how real Windows defects hid among them:

- Read and write files as UTF-8, and talk to Node in UTF-8. read_text(),
  write_text() and subprocess text=True use the locale codepage, cp1252 on
  Windows: "é", "—" and "→" arrived as "?" or crashed, some sixty tests.
  Calls to PowerShell and schtasks are left alone -- they answer in the
  console codepage.
- Import ESM harness modules by file URL (as_uri): a raw "C:\..." path is not
  a module specifier.
- test_cli_golden: mask the tmp path in its JSON-escaped form, spell it the
  POSIX way, record on Linux, mask the protocol version (the recording had
  failed everywhere since the MNP 4.0 bump) and argparse's version-dependent
  quoting; point USERPROFILE at the tmp home, or `member invite` and
  `operator pair` wrote their codes into the developer's profile.
- test_disk_io_off_loop: expect what a free loop can reach on the platform's
  timer, 15.6 ms on Windows, not an assumed 5 ms.
- test_root_paths_are_operator_only: expect the OS's spelling of the path.
- test_audio_meta_cache: find ffprobe with shutil.which.

Node suite on Windows: 1489 passed, none failed. Hub suite: 3 failures left,
all older than this change (two SQLite concurrency tests, one transfer resume).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/packages/meshbay-hub/tests/test_memory_ceiling.py b/packages/meshbay-hub/tests/test_memory_ceiling.py
index 5984292..9ea6ad3 100644
--- a/packages/meshbay-hub/tests/test_memory_ceiling.py
+++ b/packages/meshbay-hub/tests/test_memory_ceiling.py
@@ -51,7 +51,7 @@ def _lift(name, source):
 @pytest.fixture(scope="module")
 def target_fn():
     """The ceiling, its error and the real function — read, never re-typed."""
-    src = FILE_UTILS.read_text()
+    src = FILE_UTILS.read_text(encoding="utf-8")
     ceiling = re.search(r"^const MEMORY_CEILING = .*?;$", src, re.M)
     assert ceiling, "MEMORY_CEILING is gone from file-utils.js"
     # The test's own CEILING constant must agree with the source's, or every
@@ -123,8 +123,8 @@ try {{
   outcome = {{ kind: 'refused', name: err.name, message: err.message }};
 }}
 console.log(JSON.stringify(outcome));
-""")
-    proc = subprocess.run(["node", str(script)], capture_output=True, text=True)
+""", encoding="utf-8")
+    proc = subprocess.run(["node", str(script)], capture_output=True, text=True, encoding="utf-8")
     assert proc.returncode == 0, proc.stderr
     return json.loads(proc.stdout)
 
@@ -259,7 +259,7 @@ def test_no_unguarded_memory_floor(target_fn):
 def test_the_guard_is_what_the_preview_uses_too(target_fn):
     """`FilePreview` decrypts a whole entry with no writable at all, so it needs
     the same ceiling — and must import it rather than keep a second number."""
-    files_app = (STATIC / "files-app.js").read_text()
+    files_app = (STATIC / "files-app.js").read_text(encoding="utf-8")
     assert "MEMORY_CEILING" in files_app
     assert re.search(r"entry\.size\s*>\s*MEMORY_CEILING", files_app), (
         "the preview modal must refuse an oversized entry before fetching it")