v3.16.2 — Don't crash on early request failure

Fixed

• A failed request no longer crashes the whole CLI. When a model request failed early (e.g. a 404 for an unavailable model, or a 401), the failover path checked an uninitialized _stream_interrupted flag and raised AttributeError, which bubbled all the way up and dropped you back to the shell — losing your session. The flag is now initialized at startup.
• The REPL is crash-resistant in general. Any unexpected error while handling one input is now logged to ~/.kodiqa/error.log, shown as a friendly message, and returns you to the prompt with your session intact — instead of exiting. (Ctrl+C still quits.)

Tests

Regression tests for the failover early-failure path and _stream_interrupted initialization. 473 total, ruff clean.

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