Closes the last T1 BTCPay UX gap from V0.2_PLAN. Connect now checks
/v1/admin/btcpay/status first; if a connection exists, returns a
clear "already connected" guidance message pointing the operator at
Disconnect → Connect for re-authorize cases. Without this guard,
re-clicking Connect spawned a new webhook subscription on BTCPay's
side every time, leaving orphan webhooks BTCPay would keep trying
to deliver to.
The Go SDK has been written and verified — all 4 crosscheck tests
pass against the shared tests/crosscheck/vector.json (the same file
the Rust/TS/Python SDKs and the daemon test against). Pure stdlib,
zero third-party dependencies. Hosted in its own repo at
github.com/keysat-xyz/keysat-client-go (private during alpha).
This release IS the 5th-language milestone: daemon + Rust + TS +
Python + Go all agree byte-for-byte on the LIC1 wire format.
Daemon binary unchanged — wrapper-only revision.
Grant