docs: add mcpindex screened badge

[gautamgb]

Hey, mobile-mcp came back clean on mcpindex's description-level screen (injection/manipulation check on the registered tool description, nothing deeper). Added the badge to your README in case it's useful. Advisory only. Feel free to close if not a fit.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 3d714d07-725e-4484-abc7-de3bf92ddf8e

📥 Commits

Reviewing files that changed from the base of the PR and between f084553 and 90cd2b4.

📒 Files selected for processing (1)

• README.md

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Walkthrough

Added an MCP Index badge link at the top of README.md, before the existing main title.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the change: it adds an MCPIndex screened badge to the README.
Description check	✅ Passed	The description accurately describes the badge addition and its advisory screening context.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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