feat(l1): kademlia k-bucket routing table v2#6511

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azteca1998 wants to merge 7 commits intomainfrom

feat/kademlia-v2

Commits on Apr 21, 2026

Revert "revert(l1): revert "reintroduce proper Kademlia k-bucket routing table" (#6505)"
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fix(p2p): Mark unresponsive peers as disposable to prevent snapsync stalls
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fix(l1): include replacement contacts in peer discovery and iteration
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fix(l1): make contact lookup and mutation cover replacement lists
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perf(p2p): add flat connection pool decoupled from Kademlia routing table
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chore(p2p): reduce connection pool cap from 50K to 10K
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perf(p2p): O(1) random index probe and remove permanent blacklist
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