chore(deny): ignore RUSTSEC-2026-0173 (proc-macro-error2 unmaintained)

[satyakwok]

Maintenance-status advisory (no vulnerability) on a transitive dep (alloy macro ecosystem). Matches existing unmaintained-transitive ignores (paste, rustls-pemfile). Unblocks the cargo-deny CI gate so main can be protected with it required.

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ℹ️ Review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between d998d05 and 4ea6db9.

📒 Files selected for processing (1)

• deny.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/deny-ignore-proc-macro-error2

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