xchain-decoder v0.17.0

xchain-decoder v0.17.0, part of the XChain Platform v0.17.0 train.

docker stop now ends in a clean exit: the SIGTERM drain breaks the parse loop at a block
boundary, closes the API listener and both database pools, and exits 0 under a
SHUTDOWN_TIMEOUT_MS hard-exit bound, where before the process parked until SIGKILL. The
health and status payloads carry node_last_ok_at and node_unreachable, so a coin node
that has never answered is visible. The vendored mainnet activation twins are armed at
genesis under the 2026-09-09 ruling.

Full notes in CHANGELOG.md. The platform release with every component tarball is on xchain-node:
https://github.com/XChain-Platform/xchain-node/releases/tag/v0.17.0