Add draft FIP for tipset gas reservations #1218
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This FIP introduces tipset-scope gas reservations as a consensus rule for Filecoin to eliminate miner exposure to underfunded gas charges within a single tipset while preserving existing receipts and gas accounting. For each tipset, nodes derive the canonical set of explicit messages and construct a per-sender reservation plan equal to the sum, over the tipset, of each message’s
gas_limit * gas_fee_cap. The execution engine maintains an internal reservation session ledger keyed by actor identifier; when a session is open, each sender’s free balance is defined as on-chain balance minus the remaining reserved amount recorded in this ledger.#1210