docs(mcp): sync create_thread tool docs from common#8236

[devin-ai-integration]

Summary

Sync the Consensus MCP docs with Consensus-NLP/common@710090cba (PR #8236, CON-5228), which adds the create_thread tool and its MCP-to-backend call layer.

What changed

• Updated the ## Search Tool intro to point signed-in users toward create_thread for multi-step research.
• Added a new ## Research thread tools section documenting create_thread:
  • Use case (synthesis, comparisons, literature reviews).
  • OAuth-only availability note.
  • Parameters table: input_message, mode (pro/deep), filters, attachments.
  • <ResponseField> blocks for thread_id, interaction_id, title, mode, url, status, poll_after_seconds, max_wait_seconds.
  • Example prompts.

Verified against the code

• create_thread parameters and response fields were verified in common/src/python/web/mcp_server/app/tools/threads.py.
• poll_after_seconds = 30, max_wait_seconds = 180 for pro and 600 for deep.
• openapi.json was not updated because the commit only changes the MCP tool surface; no new REST endpoints or request/response schemas were added to the public HTTP API.

Upstream commits synced: 710090cba

Link to Devin session: https://app.devin.ai/sessions/da5dbdcd9db54352a3ac11ddc350cb97
Open in Devin Desktop: https://app.devin.ai/desktop/session/da5dbdcd9db54352a3ac11ddc350cb97?variant=devin
Requested by: @aakashadesara

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