feat: implement superblock based ledger crate - #15
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What changed
Implemented the
ledgercrate with superblock storage, append and reader workers, block/execution schemas, LMDB indexes, request handling, and retention hooks.Why
The engine needs a durable record of transaction execution, block metadata, and superblock boundaries that can be read independently from account storage.
Closes #7.
Impact
Ledger,LedgerHandle, retainedSuperblockstorage, and reader/appender service wiring.Reviewer notes
Superblocks own their files and indexes so retention can remove whole directories.
headis the active superblock, while sealed superblocks remain readable until truncation.Follow-up
keepercoordinates this ledger withaccountsdbupstack.