Document the WCF-vs-gRPC surface and fix a stale claim.
- README: add a "Transport matrix (WCF vs gRPC)" section with a per-operation
table. Mark the config ops the gRPC server exposes-but-untooled with a distinct
legend state (recovered RPC + bytes buffer named) vs genuinely unavailable, so
"not tooled" is not conflated with "not possible".
- README: document the gRPC live-test env vars (HISTORIAN_GRPC_HOST/_PORT/_TLS/
_DNSID/_TIMEOUT/_WRITE_SANDBOX_TAG) and refresh the Status section (test count
+ the live-verified gRPC surface).
- The "gRPC requires VerifyServerInterfaceVersion=false against a v12 server" note
was obsolete: the gate already accepts History 11 AND 12 (AcceptedVersions), and
the live gRPC suite runs with the default verification on. Corrected in the
README, CLAUDE.md, and the HistorianServerVersionGate docstring.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Joseph Doherty
b80ac07942