fix(roast): distinguish open issues from PRs

[AsperforMias]

Summary

• fetch verified open Issue counts separately from GitHub REST’s Issue+PR aggregate
• prohibit Issue-cleanup copy unless a named repo has a positive verified count
• advance roast artifacts to v10 so affected v9 reports are regenerated

Verification

• pnpm test
• pnpm typecheck
• pnpm lint
• pnpm versions:check

[vercel]

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