ensureProbe() called Registry.ProbeAll() synchronously on every status request when >30s had passed since the last probe, blocking the response on the slowest upstream (zen ~1s, frank ~1.9s, total ~1.5s) — this stalled WebUI page loads and tab switches. Now the probe runs in a background goroutine (15s budget); status returns in ~7ms and the 3s stats poll picks up updated reachability next tick. Deployed (bak .bak.20260811s), server active.
- scheduler: BuildChain sorts tiers ascending so tier 1 (highest priority) is tried first; previously descending inverted the chain (P10-1..P10-5)
- stats/api: handleStatsAPI limit→20000; CSV reads full audit via new Stats.AuditRecords (includes *.old rotation); key_names mapped by keyID() masked key; non-admin filter and keys-csv use masked keys
- server: ring buffer NewStats(10000)
- ui: dash-row card scroll area moved to table container (fix overflow below card); key view toggle (re-click same key returns to global) + kpi-exit affordance; rec-exit span
- chat: chain-failure record now surfaces first failed tier; AUTO comment sync
