Python: Fix type hint for Case and Default

[Chinedum Echeta (cecheta)]

Motivation and Context

Closes #3974

Description

Case and Default should accept SupportsAgentRun as target, and should not accept str as it throws an error here.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[Mark Wallace (markwallace-microsoft)]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/core/agent_framework/_workflows
_edge.py	229	28	87%	47, 69–70, 72, 167, 197, 446–447, 452, 456–461, 463–465, 581, 695, 702–704, 751, 779, 805, 859, 873
TOTAL	23684	2627	88%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
5176	20 💤	0 ❌	0 🔥	1m 25s ⏱️

[Copilot]

Pull request overview

This PR fixes the type hints for Case and Default classes in the workflow package to correctly accept SupportsAgentRun instances as targets, resolving issue #3974.

Changes:

• Updated Case.target and Default.target type hints from Executor | str to Executor | SupportsAgentRun
• Added import for SupportsAgentRun from ._agents module
• Reformatted tools type annotation in _types.py from multi-line to single-line

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
python/packages/core/agent_framework/_workflows/_edge.py	Fixed type hints for Case and Default target parameter to accept SupportsAgentRun instead of str, and added required import
python/packages/core/agent_framework/_types.py	Reformatted tools type annotation from multi-line to single-line

[Tao Chen (TaoChenOSU)]

Chinedum Echeta (@cecheta) thank you for your contribution!

Could you please also add unit tests for the changes?

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.