docs(mcp): document find_threads and existing thread tools (CON-5231)

[devin-ai-integration]

Summary

Adds a Research thread tools section to consensus-mcp.mdx that documents the MCP thread tools currently in Consensus-NLP/common main.

What changed

• Documented create_thread and add_to_thread (already in main from common#8236 and common#8237) so the new find_threads tool has a complete context for users.
• Documented find_threads, added in common#8238 (commit 8af06bc07):
  • Parameters: query (optional title substring), limit (1–100, default 20), offset (default 0).
  • Response: threads array with thread_id, title, status, preview, interaction_count, last_activity_at, url, plus has_more.
  • query is omitted from the backend request when empty, matching the MCP tool behavior.
• No openapi.json changes are needed because these are MCP tools, not public REST endpoints.

Upstream commits this syncs

• Consensus-NLP/common#8238 — [Threads in MCP - 6/9] - find_threads tool
• Consensus-NLP/common#8237 — [Threads in MCP - 5/9] - add_to_thread tool
• Consensus-NLP/common#8236 — [Threads in MCP - 4/9] - create_thread and MCP-to-backend call layer

Link to Devin session: https://app.devin.ai/sessions/bc752fdfa0d94be0a031442c0f060d43
Open in Devin Desktop: https://app.devin.ai/desktop/session/bc752fdfa0d94be0a031442c0f060d43?variant=devin
Requested by: @aakashadesara

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