- Add migrateChannelConfigs() and ValidateModelList() to the fresh-
install path (no config.json) so legacy env vars are migrated and
model list is validated consistently with the normal loading path
- Use os.LookupEnv instead of os.Getenv in loadProviderEnvOverrides
so explicitly empty env vars (e.g. PICOCLAW_PROVIDERS_X_API_BASE=)
can clear values from config.json
- Guard .env loading with sync.Once to avoid repeated disk I/O and
noisy log messages when LoadConfig is called from polling handlers
- Add tests: .env file loading, missing config.json with env vars,
malformed .env non-fatal behavior, and LookupEnv empty-override
Note: go.mod tcell/v2 and tview are correctly listed as direct deps
(they are imported by the launcher TUI); upstream go.mod was stale.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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