tests: add Hugging Face corpus audit lane

[gaelic-ghost]

Summary

• add a SwiftPM executable that downloads bounded Hugging Face Dataset Viewer slices and audits FetchKit ranking/snippet behavior in memory
• add an opt-in repo-maintenance wrapper for the live corpus lane
• document tuning knobs, Dataset Viewer boundaries, and roadmap progress without making default CI network-dependent

Verification

• swift build
• swift test
• scripts/repo-maintenance/validate-all.sh
• scripts/repo-maintenance/run-huggingface-corpus-audit.sh

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ce834c2c-bbad-40cc-9cd5-b6dc8dc360ff

📥 Commits

Reviewing files that changed from the base of the PR and between 7142d81 and 38cfe69.

📒 Files selected for processing (5)

• Package.swift
• ROADMAP.md
• Sources/SwiftlyFetchCorpusAudit/main.swift
• docs/maintainers/fixture-corpus.md
• scripts/repo-maintenance/run-huggingface-corpus-audit.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch tests/huggingface-corpus-audit-lane

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore Linux build for the new audit target

On non-Darwin Swift toolchains this new executable is still compiled by the default swift build, but URLRequest and URLSession.shared are provided by FoundationNetworking, not Foundation; I verified a minimal SwiftPM target with these same imports fails to type-check on Linux with cannot find 'URLRequest' in scope. Add a conditional import FoundationNetworking for Linux so the opt-in audit lane does not break the repository’s standard build/validation command outside macOS.

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