Fix Solana recovery accounting and prepare launch validation

Fix Solana recovery accounting and prepare launch validationfskroes/AllowanceKit #6 · 5 diagrams

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01 / 06Channel store now records ledger before releaseSettling a channel writes a payment row to the ledger and adjusts grants before freeing the rest of the deposit.
02 / 06Reconcile now checks finalized historyA missing channel account is no longer assumed to be refunded. The runtime reads closed signatures to verify spend.
03 / 06Seller channel store added for durable cleanupSellers save open channels and signed slots to disk so background rent cleanup survives server restarts.
04 / 06CLI sweep command added for seller channelsOperators can run channels sweep with seller keys to distribute closed channels and reclaim rent accounts.
05 / 06State file writes now use atomic sync and renameLedger appends and store snapshots sync to disk before rename so crashes never leave half-written state files.
06 / 06Everything this change touchedAll buyer escrow recovery, write-ahead ledger accounting, and seller rent cleanup across the system.

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