Life-support mass ledger — Day-1 + Day-2a + Day-2b + Day-3 (static)

Read-only artifact trail. Schema 0.1.0 (Day-1) / 0.2.0 (Day-2a/2b/3 + waste_H2O; O2_buffer already present). Crew O₂/CO₂/metabolic H₂O cited from NASA BVAD Rev2 Feb 2022 Table 3-31 (NTRS 20210024855). Plant rates marked assumption — not NASA-validated. No write APIs.

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Failure receipts

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