tests: clean up persistent temp directories

[gaelic-ghost]

Summary

• remove temporary Core Data vector-index directories during XCTest teardown
• remove temporary persistent SwiftlyFetch directories after Swift Testing persistence checks

Verification

• swift test --filter CoreDataVectorIndexTests
• swift test --filter SwiftlyFetchLibraryTests
• swift test

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 584bc240-ade9-4757-ae89-95745dd64d18

📥 Commits

Reviewing files that changed from the base of the PR and between 7aa3924 and 39574c8.

📒 Files selected for processing (2)

• Tests/RAGKitTests/CoreDataVectorIndexTests.swift
• Tests/SwiftlyFetchTests/SwiftlyFetchLibraryTests.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch tests/cleanup-temp-dirs

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