Route HINDSIGHT_API_KEY/HINDSIGHT_LLM_API_KEY, HONCHO_API_KEY, SUPERMEMORY_API_KEY, MEM0_API_KEY and RETAINDB_API_KEY reads through agent.secret_scope.get_secret so multiplexed turns resolve the active profile's key instead of the process environment. Also guard supermemory post_setup's os.environ write on not is_multiplex_active() — writing one profile's key into the process-global env pollutes sibling profiles; the single-profile convenience path is unchanged.
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