fix(lots): add workflow_id update support

[prasad-albert]

What

Callers can set and read workflow_id on lots via client.lots.update() and get_by_id(). The field is populated from the API's Workflows array on GET.

Why

The lots API supports PATCH on workflowId, but the SDK omitted it from Lot and _updatable_attributes, so callers could not assign a workflow to a lot through the SDK.

How

Initial assigns emit UPDATE (not ADD) because the API only allows workflowId under the UPDATE allow-list. storage_location create/update examples now use EntityLink instead of a partial StorageLocation.

Testing

• uv run ruff format .
• uv run ruff check . --fix
• uv run pytest tests/collections/test_lots.py::test_update_workflow_id -n 4 -v

SDK Changes

Lot.workflow_id is now readable after GET (from Workflows) and writable via LotCollection.update().

[claude]

Code Review

Issues Found

• tests/collections/test_lots.py:112-125 test_update_workflow_id consumes the seeded_workflows fixture, but this file is pinned to pytestmark = pytest.mark.xdist_group("inventory"). Per tests/TESTING.md, seeded_workflows (and its chain: seeded_parameter_groups, seeded_parameters, static_consumeable_parameter) is owned by the tasks group. Pulling it into an inventory-grouped file forces the inventory worker to rebuild the entire workflow seeding chain and mixes two independent heavy fixture chains in one module, which TESTING.md explicitly warns against ("If two tests in one file genuinely need different heavy chains, that is a sign they belong in different files"). Move this test to a tasks-grouped file, or seed a lightweight workflow locally.
• src/albert/resources/lots.py:58, 138, 142 Field/class docstrings leak backend specifics ("returned on lot GET responses", "Populated on GET from the Workflows array", "Workflow associations from the API"). Per AGENTS.md, docstrings should describe caller-facing behavior, not HTTP/GET internals.

Summary

2 issue(s) found. The xdist_group mismatch is the substantive one: it breaks the repo's parallel-test fixture-grouping contract and duplicates heavy seeding on the inventory worker. The ADD->UPDATE patch transform, model_validator population logic, and set-once handling are correct; workflow_id is properly gated by model_fields_set in the base diff.

[claude]

Looks good - no bugs or correctness issues found.