fix: use detach() to preserve stdout buffer on teardown

[cristipufu]

Summary

• Fixes ValueError when writing to stdout after interceptor teardown on Windows piped mode (cp1252 encoding)
• Replaces self.utf8_stdout.close() with self.utf8_stdout.detach() in _interceptor.py teardown to avoid destroying the shared sys.stdout.buffer
• Adds del self.utf8_stdout to guard against double-teardown since detach() is not idempotent

Context

When stdout uses non-UTF-8 encoding (e.g. cp1252 on Windows in piped mode), the interceptor creates a TextIOWrapper around sys.stdout.buffer. close() cascades to close the shared underlying buffer, making sys.stdout unusable after teardown. detach() disconnects the wrapper without closing the buffer.

Test plan

• Verify CLI runs correctly when stdout is piped (non-TTY, cp1252 encoding)
• Verify no ValueError from click.echo() after interceptor teardown
• Verify logging output still works correctly during interceptor lifecycle

🤖 Generated with Claude Code

Development Package

• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath-runtime==0.9.2.dev1000960357",

  # Any version from PR
  "uipath-runtime>=0.9.2.dev1000960000,<0.9.2.dev1000970000"
]

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
publish-url = "https://test.pypi.org/legacy/"
explicit = true

[tool.uv.sources]
uipath-runtime = { index = "testpypi" }