refactor: change `immature_transactions()` to return `BTreeSet<Txid>`#79

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xdustinface wants to merge 3 commits intofeat/transaction-record-detailsfrom

feat/immature-txids

Commits on Mar 30, 2026

refactor: change `immature_transactions()` to return `BTreeSet<Txid>`, rebuild `spent_outpoints` from `input_details`
xdustinface
committed

Commits on Mar 31, 2026

fix: rebuild `spent_outpoints` from all inputs instead of `input_details`
xdustinface
committed
fix: rename `immature_transactions()` to `immature_txids()`
xdustinface
committed