settings: schema and example for rt.mcp.uploadRoots

[m4ttheweric]

main is red on db87dc3: rt#478 added rt.mcp.uploadRoots and rt#474 made a schema mandatory for every object or array def, and each PR was green before the other merged. this adds the z.array(z.string()) schema, a good/bad example, and the regenerated lock (settings schema diff classifies it as safe: key added).

trivial, unblocks rt#475; no coderabbit wait.

🤖 Generated with Claude Code

[coderabbitai]

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Reviewing files that changed from the base of the PR and between db87dc3 and 4aec704.

📒 Files selected for processing (3)

• packages/rt-client/src/settings/__tests__/schema-examples.ts
• packages/rt-client/src/settings/registry-schemas.ts
• packages/rt-client/src/settings/schema.lock.json

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