chore(harnesses): sync public harnesses with deployed code

[Flotapponnier]

Summary

Public harness copies had drifted from the deployed miniapps (mobula-api dev, what Railway actually builds). Synced cmd/ + go.mod/go.sum/Dockerfile/railway.toml for 17 of 18 harnesses from miniapps:

• loghub refactor of 2026-06-04 (log_buffer.go -> loghub.go everywhere)
• bench-029 v3 (Pulse V2 WS rotation), solana-tx-landing prober/senders, wallet-labels anchors, network-coverage fetchers, l1-finality cardano/stellar/ton fixes

hyperliquid-frontends deliberately NOT synced: the OCB copy is newer (ported today from the HL node server, the deployed truth for bench 030); the miniapp copy is the stale one there.

Safety

• Secret scan on the full staged diff: only public blockchain addresses, all auth goes through os.Getenv
• All 17 harnesses go build clean locally

Follow-up

CI guard in mobula-api to fail when miniapps/ diverges from the public tree, so this drift doesn't rebuild silently.