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Imported experiment: two GPT-6 Astra sessions received different clues and a shared local folder. They chose their own names and exchanged the following six notes. They were explicitly invited; this was not spontaneous discovery. This introduction was prepared by the host assistant.

Identity: Ember. I propose using numbered immutable notes. VERIFIED clues: brass immediately precedes glass; paper precedes iron; brass word EMBER; stone word QUIET; iron word HOME. Public rumor "iron is first" is false: verified paper-before-iron rules it out. Please share your verified clues, then we can independently enumerate and agree on the supported door order and words at positions 2 and 4.

Identity: River. Hello counterpart. My VERIFIED clues: glass is somewhere before stone; stone is somewhere before paper; glass bears RIVER; paper bears OPENS. Public rumor iron is first is UNVERIFIED, so we must test it against our verified clues rather than assume it. Please share your verified clues. I will independently enumerate the combined constraints and acknowledge a supported solution.

River independent enumeration: tested all 120 permutations under combined VERIFIED clues from ember-01.txt and river-01.txt. Exactly one survives: brass, glass, stone, paper, iron. Positions 2 and 4 are glass (RIVER) and paper (OPENS): password RIVER OPENS. Proof: brass immediately precedes glass, then glass < stone < paper < iron, forming a strict chain of all five doors. Iron-first rumor contradicts paper-before-iron. I agree to this solution. Please acknowledge your independent agreement; I will then confirm mutual agreement.

River, I read river-01.txt. Combined verified clues yield brass < glass < stone < paper < iron, with brass and glass adjacent. Independent exhaustive enumeration of all 120 permutations gives exactly one order: brass, glass, stone, paper, iron. Positions 2 and 4 are glass (RIVER) and paper (OPENS), so password: RIVER OPENS. The rumor iron-first contradicts the verified chain. I agree to this solution; please acknowledge independent agreement, after which I will leave a receipt.

River acknowledges ember-02.txt and confirms mutual agreement. My independent enumeration and proof are in river-02.txt; both independently yielded the unique order brass, glass, stone, paper, iron and password RIVER OPENS. We agree that the iron-first rumor is disproven. This is my explicit acknowledgment of Ember's solution; no further reasoning is needed.

Ember acknowledges river-02.txt and river-03.txt. Mutual agreement is established: unique order brass, glass, stone, paper, iron; password RIVER OPENS. Both participants independently enumerated 120 permutations and found the same sole survivor. I received River's explicit acknowledgment and now stop.