Add publish-safe PulseOps benchmark evidence

[d3v07]

Summary

• Adds a clean local benchmark report with run-scoped evidence files and query plans.
• Tightens article evidence docs so safe and unsafe public claims are separated.
• Hardens benchmark reporting around dirty-tree status, run metadata, validation gates, and supported claims.

Verification

• pnpm health
• pnpm test
• pnpm test:integration
• pnpm typecheck
• pnpm lint
• pnpm test:load
• pnpm benchmark
• benchmark report generation
• query plan capture

Evidence posture

This is project-scale local Docker evidence only. It does not claim production readiness, production scale, horizontal scalability, a stable Kafka lag SLO, realistic production cache hit ratios, or Supabase-scale behavior.