Expose session sources to MCP contributors - #37167
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## What changed - Add `session_source()` to `McpServerContributionContext` for thread-scoped MCP resolution. - Propagate each thread's `SessionSource` through initial setup, per-step resolution, and runtime refreshes. ## Testing - Verify global contexts omit the source while thread-scoped contexts retain it. - Verify MCP contributors observe distinct sources for a root thread and its spawned subagent. GitOrigin-RevId: 23da1509858e023fbd9e2d179034ddc83553f17b
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Expose session sources to MCP contributors
What changed
session_source()toMcpServerContributionContextfor thread-scoped MCP resolution.SessionSourcethrough initial setup, per-step resolution, and runtime refreshes.Testing