f824116ff9
When --migrate-secrets is not passed (the default), API keys like OPENROUTER_API_KEY are silently skipped with no warning. Users don't realize their keys weren't migrated until the agent fails to connect. Add a post-migration warning with actionable instructions: either re-run with --migrate-secrets or add the key manually via hermes config set. Cherry-picked from PR #1593 by ygd58.