teknium1 8311e8984b fix: preflight context compression + error handler ordering for model switches ...

Two fixes for the case where a user switches to a model with a smaller
context window while having a large existing session:

1. Preflight compression in run_conversation(): Before the main loop,
   estimate tokens of loaded history + system prompt. If it exceeds the
   model's compression threshold (85% of context), compress proactively
   with up to 3 passes. This naturally handles model switches because
   the gateway creates a fresh AIAgent per message with the current
   model's context length.

2. Error handler reordering: Context-length errors (400 with 'maximum
   context length' etc.) are now checked BEFORE the generic 4xx handler.
   Previously, OpenRouter's 400-status context-length errors were caught
   as non-retryable client errors and aborted immediately, never reaching
   the compression+retry logic.

Reported by Sonicrida on Discord: 840-message session (2MB+) crashed
after switching from a large-context model to minimax via OpenRouter.

2026-03-04 14:42:41 -08:00

14 KiB

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