`SESSION_FORMAT_VERSION` is the only value that names the Session format
generation. Two other version fields had moved to 2 alongside it:
- The `dsh_session_log` request extension's outer schema `version` returns
to 1 and its Session header projection keeps `seedLength`, derived from
the logical inherited cut, so the external wire is unchanged in this PR;
`sessionFormatVersion` alone identifies the embedded generation.
- The `sessionStats` projection unit's `stateVersion` returns to 1: the
projection cache binds every checkpoint to the format generation, so a
generation change discards old rows without a unit version bump.
Test doubles and the standalone Client fixture that build a current
header now spell `SESSION_FORMAT_VERSION` instead of the literal.
Single RemoteError with a merge-extensible, domain-prefixed code map;
owners throw at the failure point; streams surface marked failures;
clients consume ctx.remote directly with isRemoteFailure as the only
discrimination point and construct no failure instances.
The goal domain has been served by GoalService's @Remote namespace since it
shipped; the API Proxy copy was a second implementation of the same six
mutations. Remove the goals contract, schemas, route rows, IApiClient stub,
host implementation, and the fixture's compatibility face, leaving
ctx.remote.goals as the only path.
The fixture's goal fold keeps its coverage through the Goal Remotes: its
lifecycle case moves out of the unary-dispatch test, which no longer has
goal rows to cover.
Tianyi Cui