refactor(auth): export Codex constants and slim down handler

fix(auth): normalize plan type filenames to lowercase

feat(auth): add hashed account ID to credential filenames for team plans

fix(codex): use unicode title casing for plan

feat(codex): include plan type in auth filename

refactor(config): migrate to `SDKConfig` and streamline proxy handling

rebuild branch

remove all

v6 version first commit

refactor(auth): Centralize logging for saving credentials

Update internal module imports to use `v5` package path

Replace `path` with `filepath` for cross-platform compatibility

Refactor codebase

Add openai codex support