* fix: isolate profile .env secrets on switch
* fix: move direct os.environ set after _reload_dotenv to survive profile isolation
The profile env isolation in _reload_dotenv now clears previously tracked
env keys before re-reading .env. When apply_onboarding_setup set
os.environ BEFORE _reload_dotenv, the key was immediately cleared.
Move the belt-and-braces os.environ set to AFTER _reload_dotenv so
the API key survives regardless of profile tracking state.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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