core: add provider test coverage for upcoming refactor

Add comprehensive test suite for Provider module to ensure safe
refactoring of provider internals. Tests cover:
- Provider loading from env vars and config
- Provider filtering (disabled_providers, enabled_providers)
- Model whitelist/blacklist
- Model aliasing and custom providers
- getModel, getProvider, closest, defaultModel functions

Also adds Env module for instance-scoped environment variable access,
enabling isolated test environments without global state pollution.
This commit is contained in:
Dax Raad
2025-12-03 18:30:42 -05:00
parent 7a4aa68706
commit ee4437ff32
4 changed files with 1805 additions and 11 deletions

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