fix(cli): make the command-line client work on Windows

Its suite had only run on Linux. On Windows, against a real hub and node and
from the installed meshbay-cli.exe:

- secrets.enc was written in text mode (os.open without O_BINARY): every 0x0A
  of the ciphertext became CR LF and the saved session "does not open with
  its key" on the next run.
- isatty() is true for NUL, so a script run with `< NUL` or by the Task
  Scheduler was asked questions instead of told to pass --yes;
  output.terminal() checks for a real console.
- Ctrl+C waited for the selector loop's next timer, up to half a minute in
  `chat --follow`; the loop now points the signal wakeup at its self-pipe,
  as the proactor does.
- Right-click copy and paste raised: asyncio cannot start a process on the
  selector loop; the clipboard tool runs in a thread.
- Tab completion of remote paths ran on the default (proactor) loop, which
  never opens a node, and wrote in the locale encoding; the PowerShell script
  now reads it as UTF-8.
- `get -R` into a folder past MAX_PATH died with a traceback; get, put, the
  resume file and the interactive mode use the extended form at each disk
  call, as the node does.
- `groups` showed a SQLite hub's naive UTC time as local time.

The opt-in end-to-end suite now runs on Windows (16 tests: Chrome found under
Program Files and started with the real environment, VLC as the player, Ctrl+C
through a console of its own, PowerShell 5.1 completion of an accented name).

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

1 files changed, 34 insertions, 0 deletions

diff --git a/packages/meshbay-cli/tests/test_ctrl_c.py b/packages/meshbay-cli/tests/test_ctrl_c.py
new file mode 100644
index 0000000..53a798a
--- /dev/null
+++ b/packages/meshbay-cli/tests/test_ctrl_c.py
@@ -0,0 +1,34 @@
+"""
+Ctrl+C stops the client at once, whatever its loop is waiting for.
+
+On Windows the client runs a selector loop (aiortc's ICE needs one), and a
+console event does not interrupt select(): Ctrl+C waited for the loop's next
+timer — half a minute in `chat --follow` between pings.
+"""
+
+import sys
+import time
+
+from console import ctrl_c, interruptible
+
+IDLE = ("import asyncio, sys\n"
+        "from meshbay_cli.__main__ import loop_factory\n"
+        "print('ready', flush=True)\n"
+        "try:\n"
+        "    asyncio.run(asyncio.sleep(60), loop_factory=loop_factory())\n"
+        "except KeyboardInterrupt:\n"
+        "    sys.exit(130)\n")
+
+
+def test_ctrl_c_wakes_an_idle_client_at_once():
+    proc = interruptible([sys.executable, "-c", IDLE], None)
+    try:
+        assert proc.stdout.readline().strip() == "ready", proc.stderr.read()
+        started = time.monotonic()
+        ctrl_c(proc)
+        proc.wait(timeout=30)
+        assert proc.returncode == 130, proc.stderr.read()
+        assert time.monotonic() - started < 5
+    finally:
+        if proc.poll() is None:
+            proc.kill()