audit: bench-published sync + dead code cleanup

[Flotapponnier]

Summary

• Regenerate `bench-published.json` from git history via `scripts/generate-bench-published.mjs`: was 65 entries (missing 33 live benches, included 4 deleted ones), now 93 correct entries with proper `datePublished` dates for every live bench
• Remove dead manifold-specific code from `pm-venues-leaderboard.tsx`: `PlayMoneyBadge` component + its two tooltip ternaries (manifold dropped from PM_VENUES in prior PR, these code paths never executed)

Test plan

• `/prediction-markets` hub loads, leaderboard renders without TS errors
• No `bench-published.json` entries missing for any bench page (JSON-LD `datePublished` is now correct for all 93)