[Custom Transactions] Add `TxBuilder::get_available_balances`#4026

Merged

TheBlueMatt merged 14 commits intolightningdevkit:mainfrom

tankyleo:balances

Feb 25, 2026

Commits on Feb 24, 2026

Create `ChannelConstraints` to hold parameters for balance calculations
tankyleo
committed
Extract dust exposure calculation in `tx_builder` to its own function
tankyleo
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Rewrite `get_available_balances_for_scope` using `tx_builder` functions
tankyleo
committed
Move `ChannelContext::get_available_balances_for_scope` to `tx_builder`
tankyleo
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Format `tx_builder::get_available_balances`
tankyleo
committed
Multiply the feerate by the spike multiple in `can_accept_incoming_htlc`
tankyleo
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Erase `get_pending_htlc_stats`, `next_*_commit_tx_fee_msat` in `channel`
tankyleo
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Return `AvailableBalances` in `get_channel_stats`
tankyleo
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Let callers handle errors on `get_available_balances_for_scope`
tankyleo
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Format all `get_available_balances` methods in `channel`
tankyleo
committed