Teknium 3186668799 feat: per-turn primary runtime restoration and transport recovery (#4624) ...

Makes provider fallback turn-scoped in long-lived CLI sessions. Previously, a single transient failure pinned the session to the fallback provider for every subsequent turn.

- _primary_runtime dict snapshot at __init__ (model, provider, base_url, api_mode, client_kwargs, compressor state)
- _restore_primary_runtime() at top of run_conversation() — restores all state, resets fallback chain index
- _try_recover_primary_transport() — one extra recovery cycle (client rebuild + cooldown) for transient transport errors on direct endpoints before fallback
- Skipped for aggregator providers (OpenRouter, Nous)
- 25 tests

Inspired by #4612 (@betamod). Closes #4612.

2026-04-02 10:52:01 -07:00

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