f1ea4a56c ("cover the remaining setup-time .env reads with utf-8-sig",
following 75afc47ba for mem0/hindsight) swept this class; openviking's
_write_env_vars was missed and still reads with strict utf-8.
It copies every existing line through on each update, so the read decides
whether a credential update lands:
BOM'd .env -> the first key never matches, so the old line survives and
the new value is appended as a duplicate. .env loaders keep
the first occurrence, so the update silently does nothing.
cp1252 .env -> UnicodeDecodeError aborts setup outright.
Read exactly like the canonical hermes_cli/config.py save_env_value
(utf-8-sig + errors="replace"). A plain UTF-8 file rewrites byte-identically.
Scope: hermes_cli/memory_setup.py has the same read but is already the
subject of #30281 / #60587, so it is left alone here.
(cherry picked from commit 175c6852c2c255b3219575b5de0b1b70f1f0efcb)
Drexuxux
dde7075d6c