Renames:
- LUX_ALLOW_FAKE_TFHE_FOR_TESTING_ONLY -> ALLOW_FAKE_TFHE_FOR_TESTING_ONLY
(test opt-in for the placeholder UNSAFE TFHE primitive)
- LUX_MPC_CONFIG -> MPC_CONFIG (docs/compose env)
- LUX_MPC_MODE -> MODE (Viper config key 'mode' override)
The brand prefix was noise; the env var names speak for themselves.
README/LLM/config docs updated to reflect that Viper has no env prefix
configured (AutomaticEnv reads uppercased config keys directly), so the
prior 'LUX_MPC_*' documentation was inaccurate.
Note: file format magic in pkg/kvstore/zap_backup.go remains
"LUX_MPC_BACKUP" — that's an on-disk format identifier, not an env var.
Renaming it would invalidate every existing backup file.
BREAKING: external callers/operators must update their environment
variable names. Per CLAUDE.md no-backwards-compatibility rule, the old
forms are removed.
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