fix: unwrap PEP 604 union types (X | None) in _unwrap_optional

[radu-mocanu]

Summary

• fix job attachment detection failing on Python 3.10-3.13 when agent input fields use X | None syntax
• _unwrap_optional now handles both typing.Union (Optional[X]) and types.UnionType (X | None)

Why

on Python 3.10-3.13, get_origin(X | None) returns types.UnionType instead of typing.Union. the _unwrap_optional check was only testing for typing.Union, so Attachment | None field annotations were never unwrapped to Attachment, causing get_job_attachment_paths to return no paths and job_attachments to stay empty. Python 3.14 changed get_origin to return typing.Union for both forms, masking the bug locally.

Development Package

• Use uipath pack --nolock to get the latest dev build from this PR (requires version range).
• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath-langchain==0.10.1.dev1008004366",

  # Any version from PR
  "uipath-langchain>=0.10.1.dev1008000000,<0.10.1.dev1008010000"
]

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

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

[tool.uv]
override-dependencies = [
    "uipath-langchain>=0.10.1.dev1008000000,<0.10.1.dev1008010000",
]