security: remove private MCP configuration from public SDK

[pbc1017]

Summary

Remove developer-local MCP configuration from the public SDK repository and prevent it from being committed again.

Changes

• Delete tracked .mcp.json and .claude/settings.json
• Ignore local MCP and Claude configuration files
• Reject internal MCP names, App Studio identifiers, and non-public App Studio references in public content
• Scan full Git history with Gitleaks in CI

Test Plan

• Public-content checker passes
• Negative fixture is rejected by the checker
• Shell syntax and diff checks pass
• Full-history Gitleaks scan passes on the reviewed history

🤖 Generated with Codex

[channeltalk]

https://desk.channel.io/#/channels/1/team_chats/groups/371781/6a686aec353999e1efd1

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3702fc3b-ba0d-4a19-9ff9-06be23d0e712

📥 Commits

Reviewing files that changed from the base of the PR and between 88b5086 and ce83778.

📒 Files selected for processing (5)

• .claude/settings.json
• .github/workflows/ci.yml
• .gitignore
• .mcp.json
• scripts/check-public-content.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/remove-private-mcp-config

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