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Follow-up to review feedback: - mem0 _prompt_api_key read .env with the locale default, so a Notepad BOM hid the first key from the masked current-value lookup; read it with utf-8-sig + errors=replace like the canonical readers in hermes_cli/config.py. - hindsight _load_simple_env used plain utf-8; it also parses the Hermes .env during post_setup, where a BOM stuck to the first key. Switch to utf-8-sig + errors=replace. - Add hindsight regressions: BOM key matching in _load_simple_env and in the cloud post_setup writer, plus non-ASCII round-trip preservation, and a mem0 regression for the BOM'd masked-key lookup. The BOM tests fail without the fix on any platform. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>