Adds an internal RE probe (HistorianGrpcTagWriteOrchestrator.
ProbeDeleteTagExtendedPropertiesAsync) testing whether gRPC's single shared
channel lifts the WCF per-connection working-set wall that blocks DelTep.
Live result (2023 R2, History iface 12): both GetTgByNm + GetTepByNm primes
succeed on the one shared channel, yet DelTep is still rejected (native code=1)
and the property survives. So the working set is populated by the native
client's in-process registration state, not the wire session — neither WCF's
per-service channels nor gRPC's shared channel reproduce it. DelTep stays
server-blocked on BOTH transports and remains unshipped.
Gated negative test DeleteTagExtendedProperties_OverGrpc_ProbeMultiplexedChannel
pins this (primes succeed, delete rejected, prop survives) and flips if a future
server/registration lifts the wall. Comment in HistorianClient records the
probe. 321 offline tests pass; live test passes bounded at ~11s.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Joseph Doherty
2bd86e4e83