Add env variable override for the default agent provider#999
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Mirrors ROAST_DEFAULT_AGENT_PROVIDER (#999) for the chat cog. Users with a non-OpenAI key can now set this once instead of adding `provider` to every workflow config block. Precedence: explicit workflow config > env var > built-in default (:openai). Invalid values raise InvalidConfigError at resolution time. Closes #1000 Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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Closes #998
Adds ROAST_DEFAULT_AGENT_PROVIDER as an env variable. If a workflow sets a provider, that takes precedence.
The value set in the env var is stripped and downcased, so that
PI,piandpi(with a trailing space) all resolve to:pi