Python: Fix MCP header provider across transport tasks#6162
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Fixes #4808.
MCPStreamableHTTPToolcurrently stores per-callheader_provideroutput in aContextVarthat the httpx request hook reads later. With the streamable HTTP transport, outbound requests can be sent from a transport task that was created beforecall_tool()set that context, so the hook can see an empty value and skip the dynamic headers.This keeps the active headers on the tool instance for the duration of the tool call, so the existing request hook reads the current header snapshot even when the transport sends from another task. The previous value is restored after the call completes.
Tested:
python -m pytest python/packages/core/tests/core/test_mcp.py -k header_provider -qpython -m ruff check python/packages/core/agent_framework/_mcp.py python/packages/core/tests/core/test_mcp.pygit diff --check