- TUI/streaming: add a client-side streaming watchdog to `tui-event-handlers` so the `streaming · Xm Ys` activity indicator resets to `idle` after 30s of delta silence on the active run. Guards against lost or late `state: "final"` chat events (WS reconnects, gateway restarts, etc.) leaving the TUI stuck on `streaming` indefinitely; a new system log line surfaces the reset so users know to send a new message to resync. The window is configurable via the new `streamingWatchdogMs` context option (set to `0` to disable), and the handler now exposes a `dispose()` that clears the pending timer on shutdown. (#67401) Thanks @xantorres.

- Extensions/lmstudio: add exponential backoff to the inference-preload wrapper so an LM Studio model-load failure (for example the built-in memory guardrail rejecting a load because the swap is saturated) no longer produces a WARN line every ~2s for every chat request. The wrapper now records consecutive preload failures per `(baseUrl, modelKey, contextLength)` tuple with a 5s → 10s → 20s → … → 5min cooldown and skips the preload step entirely while a cooldown is active, letting chat requests proceed directly to the stream (the model is often already loaded via the LM Studio UI). The combined `preload failed` log line now reports consecutive-failure count and remaining cooldown so operators can act on the real issue instead of drowning in repeated warnings. (#67401) Thanks @xantorres.

- Agents/replay: re-run tool/result pairing after strict replay tool-call ID sanitization on outbound requests so Anthropic-compatible providers like MiniMax no longer receive malformed orphan tool-result IDs such as `...toolresult1` during compaction and retry flows. (#67620) Thanks @stainlu.

- Gateway/startup: fix spurious SIGUSR1 restart loop on Linux/systemd when plugin auto-enable is the only startup config write; the config hash guard was not captured for that write path, causing chokidar to treat each boot write as an external change and trigger a reload → restart cycle that corrupts manifest.db after repeated cycles. Fixes #67436. (#67557) thanks @openperf

## 2026.4.15-beta.1