Clean CLI and host test boundaries

[RhysSullivan]

Summary

• narrow the CLI helper native Error assertion boundary
• catch GraphQL preset introspection failures by tag
• manage MCP stdio integration cleanup with Effect acquire/release

Verification

• bunx oxlint --format=unix tests/tools-cli.test.ts tests/presets-reachable.test.ts packages/hosts/mcp/src/stdio-integration.test.ts
• bunx --bun vitest run tests/tools-cli.test.ts
• bunx --bun vitest run tests/presets-reachable.test.ts -t "graphql presets are reachable endpoints"
• cd packages/hosts/mcp && bunx --bun vitest run src/stdio-integration.test.ts

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