fix(worker): dedupe discovered workflows by defining module

[HHK1]

Problem

discover_workflows() uses inspect.getmembers(module, inspect.isclass) which returns every class accessible in the module's namespace — including classes imported from sibling modules.

When one workflow imports another to call it via execute_workflow (a common parent/child pattern), the child workflow class is picked up by the scanner in both the module that defines it and the module that imports it. Both registrations are passed to run_worker, and Temporal rejects the duplicate at worker startup:

ValueError: More than one workflow named mna-flash-dd-managed
RuntimeError: Failed validating workflow mna-eval

Repro

# workflows/child.py
@workflow.define(name="child")
class ChildWorkflow: ...

# workflows/parent.py
from workflows.child import ChildWorkflow  # re-exported into parent's namespace

@workflow.define(name="parent")
class ParentWorkflow:
    @workflow.entrypoint
    async def run(self, params): 
        return await execute_workflow(ChildWorkflow, ...)

Worker startup fails because ChildWorkflow is discovered twice.

Fix

• Filter on obj.__module__ == modname so only classes defined in the scanned module count.
• Keep a seen set as a belt-and-braces guard against any other duplicate paths.

Test

Manually verified on a project that hit the original error — worker now starts cleanly with two workflows where one imports the other.

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