docs: add GetXAPI pairing recipe for cheaper Twitter read operations

[bozad]

This adds a short "Pairing: GetXAPI MCP server" section to the README documenting an optional alternative backend pattern.

What this PR does

• Documents a side-by-side integration pattern: keep this project for its primary workflow, optionally pair with the GetXAPI MCP server for read operations (search, profile, followers).
• Links to a worked reference PR in a sibling project (feat: add optional GetXAPI backend for search_tweets GenAIwithMS/twitter-mcp#3) for users who want to add a backend toggle at the code level.
• Notes the pairing is fully optional, default behavior unchanged.

Why this is useful for this project's users

Some users of MCP servers in this niche want flexibility to test or route specific read operations through a different backend during development. Documenting this pairing pattern lets users opt in without forking the project. It also surfaces tool-level compatibility (same tool names, same JSON-RPC contract) for downstream AI clients composing multiple MCP servers.

What this PR does NOT change

• No code changes
• No new dependencies
• No behavior change for existing users
• README only

Related

• Reference PR for code-level backend toggle: feat: add optional GetXAPI backend for search_tweets GenAIwithMS/twitter-mcp#3 (merged)
• Already-merged precedents in this niche: docs: add GetXAPI pairing recipe for cheaper Twitter read operations DataWhisker/x-mcp-server#9 and docs: add GetXAPI pairing recipe for cheaper Twitter read operations hridaydutta123/awesome-twitter-tools#37
• GetXAPI MCP server source: https://github.com/getxapi/getxapi-mcp

Happy to adjust wording or remove anything that does not fit the project voice.

Summary by CodeRabbit

• Documentation
  • Added documentation describing an optional GetXAPI MCP server integration for testing read-heavy operations. Includes integration patterns, compatible tools, and repository reference. This optional pairing does not affect existing functionality.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c6ed2e28-9033-4df1-afbf-84c342b6a5c0

📥 Commits

Reviewing files that changed from the base of the PR and between 3846c65 and ee17a78.

📒 Files selected for processing (1)

• README.md

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Walkthrough

A new section is appended to README.md documenting an optional pairing of AgenticOS with the GetXAPI MCP server for read-heavy Twitter/X operations. It describes two integration patterns, lists a compatible tool subset, provides the repository link, and states that existing behavior is unchanged.

Changes

GetXAPI Integration Documentation

Layer / File(s)	Summary
GetXAPI optional backend section README.md	Appends a 22-line section describing the optional GetXAPI MCP server pairing, two integration patterns, a compatible read-tool subset, the repository link, and a note that existing users are unaffected.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 Hippity-hop, a new note appears,
A section for reading with minimal fears,
GetXAPI paired, an optional route,
No breaking of things, that's what it's about.
The README grows richer, the rabbit hops on! 🌿

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding documentation about an optional GetXAPI integration for cheaper Twitter read operations, which is exactly what the README.md changes accomplish.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Api Keys	✅ Passed	PR adds documentation section to README with no literal API keys; searches for common key patterns (sk-, pk_, long hex strings) and suspicious content found no actual credentials in codebase.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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