Update LND, Aperture, and Taproot Assets to revisions using the
btcd v2 modules, and update lndclient to v0.21.0-3. Migrate Loop
chain, transaction, and address types to their corresponding v2
packages.
The lndclient release includes the migration from:
https://github.com/lightninglabs/lndclient/pull/280
Taproot Assets is temporarily replaced with its btcd v2 revision
because the v0.8 release branch has not adopted the new modules.
This raises the minimum Go version to 1.26 and changes exported
address types.
Use each channel's local balance minus its reserve when simulating Loop
Out payment bandwidth, clamping the result at zero. This prevents swaps
from starting when the gross balance covers the amount and routing fee
but the spendable balance does not.
Add one-sat boundary tests and a bug-fix release note. Leave a TODO for
server-fee and prepay capacity because enforcing their maximum fee caps
could reject viable swaps whose actual routing fees are lower.
Document every published Loop release and preserve authoritative notes.
Add the next-release workflow and rebuild chronological navigation.
Rename the reproducible-build guide for clarity.
