fix(windows): native Windows correctness for CLI, gateway status, banner, and WSL browser paths

Salvaged from #57016 by @lEWFkRAD:
- cli.py: handle file:///C:/... drive-letter URIs on nt (strip the
  leading slash urlparse leaves); join Termux example paths with literal
  forward slashes so hints stay POSIX on Windows.
- gateway/status.py + hermes_cli/gateway.py: normalize backslashes to
  forward slashes before the HERMES_HOME substring match so separator
  style cannot defeat profile ownership detection.
- hermes_cli/banner.py: cprint degrades to plain print when
  prompt_toolkit has no console (NoConsoleScreenBufferError on
  redirected/absent Windows stdout).
- hermes_cli/browser_connect.py: posixpath.join for WSL /mnt/c/... bases
  (os.path.join would emit backslashes on nt).
- Test hardening: symlink skip-guards, USERPROFILE alongside HOME for
  ntpath.expanduser, SIGKILL absence skipif fixed via monkeypatch,
  drive-letter URI / separator-normalization / banner-fallback coverage.

Dropped from the original PR: tests/cli/conftest.py fixture and the
AppSession _output monkeypatch — main's merged tests/cli/conftest.py
already handles that prompt_toolkit pollution.

tests/cli/test_worktree.py

@@ -416,6 +416,21 @@ class TestMultipleWorktrees:
             assert not Path(info["path"]).exists()
 
 
+def _can_symlink():
+    """Check if we can create symlinks (needs admin/dev-mode on Windows)."""
+    import tempfile
+    try:
+        with tempfile.TemporaryDirectory() as d:
+            src = Path(d) / "src"
+            src.write_text("x")
+            lnk = Path(d) / "lnk"
+            lnk.symlink_to(src)
+            return True
+    except OSError:
+        return False
+
+
+@pytest.mark.skipif(not _can_symlink(), reason="Symlinks need elevated privileges")
 class TestWorktreeDirectorySymlink:
     """Test .worktreeinclude with directories (symlinked)."""