tests: add Hugging Face corpus audit coverage

[gaelic-ghost]

Summary

• add a checked-in Hugging Face-derived audit micro-corpus spanning TinyStories, Simple Wikipedia, and Gutenberg Poetry samples
• cover the combined corpus in the default in-memory FetchKit path and the macOS SearchKit path
• document the fixture source boundary and roadmap progress while leaving the larger real-corpus audit open

Verification

• swift test --filter FixtureCorpusQualityTests
• swift test --filter SearchKitFetchIndexTests
• swift test
• scripts/repo-maintenance/validate-all.sh

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e432f4e6-4b99-495e-9adb-22bfb0787161

📥 Commits

Reviewing files that changed from the base of the PR and between 7f7a016 and 1ac2860.

📒 Files selected for processing (5)

• ROADMAP.md
• Tests/FetchKitTests/FixtureCorpusQualityTests.swift
• Tests/FetchKitTests/SearchKitFetchIndexTests.swift
• Tests/SwiftlyFetchTestFixtures/HuggingFaceAuditCorpus.swift
• docs/maintainers/fixture-corpus.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch tests/real-corpus-quality-audit

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