Resolve A2A and MCP bindings by name

[radugheo]

• Resolve Unified Runtime MCP and remote A2A resources by display name through the SDK name= lookup.
• Preserve execution-folder routing and lazy URL resolution while switching resource identifiers to display names.
• Require the released uipath-platform>=0.2.15,<0.3.0, bump uipath-langchain to 0.15.0, and refresh the lockfile.
• Update focused MCP and A2A tool coverage.

[Copilot]

Pull request overview

This PR updates the MCP and A2A tool resolution flow to use name-based lookups in the UiPath SDK (with legacy slugs passed as compatibility hints), and adjusts test coverage to match the new binding behavior.

Changes:

• Switch MCP server resolution from retrieve_async(slug=...) to retrieve_by_name_async(name=..., legacy_slug=...).
• Switch Remote A2A agent resolution from retrieve_async(slug=...) to retrieve_by_name_async(name=..., legacy_slug=...) and update the A2aClient interface accordingly.
• Update MCP/A2A tests to mock and assert the new name-based SDK calls.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/agent/tools/test_mcp/test_mcp_tool.py	Updates MCP tool invocation test mocks to use retrieve_by_name_async.
tests/agent/tools/test_mcp/test_mcp_client.py	Updates MCP client tests to mock/assert retrieve_by_name_async arguments (name + legacy_slug + folder_path).
tests/agent/tools/test_a2a_tool.py	Updates A2A tests for the new client fields and retrieve_by_name_async call shape.
src/uipath_langchain/agent/tools/mcp/mcp_client.py	Changes MCP server URL resolution to use name-based retrieval with legacy slug fallback.
src/uipath_langchain/agent/tools/a2a/a2a_tool.py	Changes A2A agent URL resolution to use name-based retrieval with legacy slug fallback; updates client construction accordingly.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud