[consensus] Strict leader reputation with 1 faulty validator at 4k TPS

[danielxiangzl]

Summary

• daniel/latency-baseline-by-skip + daniel/strict-leader combined
• realistic_env_max_load at ConstTps 4k with 1 faulty validator (last by index, skips 50% of proposals)
• Strict leader reputation: failure_window_num_validators_multiplier added (default 0, falls back to proposer window)
• Prototype/experiment code — not for merge to main

Test plan

• Run forge land_blocking and compare latency against daniel/latency-baseline-by-skip (PR [forge] Latency baseline with 1 slow validator at 4k TPS #19330)

🤖 Generated with Claude Code

[github-actions]

✅ Forge suite realistic_env_max_load success on a9e825cd8958042e91596a1b0d57e5a53edad938

two traffics test: inner traffic : committed: 4000.01 txn/s, latency: 408.26 ms, (p50: 300 ms, p70: 300, p90: 600 ms, p99: 1200 ms), latency samples: 74420
two traffics test : committed: 100.00 txn/s, latency: 354.20 ms, (p50: 300 ms, p70: 300, p90: 400 ms, p99: 900 ms), latency samples: 4240
Latency breakdown for phase 0: ["MempoolToBlockCreation: max: 0.157, avg: 0.127", "ConsensusProposalToOrdered: max: 0.154, avg: 0.153", "ConsensusOrderedToCommit: max: 0.016, avg: 0.015", "ConsensusProposalToCommit: max: 0.170, avg: 0.168"]
Max non-epoch-change gap was: 1 rounds at version 9854 (avg 0.00) [limit 4], 1.19s no progress at version 1423373 (avg 0.06s) [limit 15].
Max epoch-change gap was: 0 rounds at version 0 (avg 0.00) [limit 4], 0.00s no progress at version 0 (avg 0.00s) [limit 16].
Test Ok

• Grafana dashboard
• Humio Logs
• Axiom Logs
• Validator CPU Profile
• Fullnode CPU Profile
• Test runner output
• Test run is land-blocking

[danielxiangzl]

Closing in favor of the consolidated weighted-leader approach in #19343 (canonical) + #19341 (forge experiment). The fixed LatencyWeightedHeuristic combined with proposer_window_num_validators_multiplier=50 provides continuous downweighting of slow/failing validators without needing the asymmetric strict-classification hack. See discussion in #19343.