**Stack 3/5** — base #4124. Part of the #4096 split; see #4096 for the
overall picture.
> Review after #4123 and #4124.
## What this is
The OPC 10000-210 Relative Spatial Location and OPC 10000-211 Global
Positioning companion models, with their server and client libraries,
plus the ISA-95 migration onto the shared geolocation seam.
## Why it is one change
A deployment writes **one** provider implementation and both OPC
10000-211 and OPC 10030 are served from it. The specifications disagree
on representation, not on content:
- GPOS publishes the structured `GlobalLocationDataType` and validates
the EPSG code against the configured CRS.
- ISA-95 publishes the same sample as the `String` array that OPC 10030
§8.3.2.2 requires.
Splitting them would mean two provider interfaces for one physical
sensor, which is exactly what this avoids. The seam itself lives in
`Opc.Ua.Server` and landed in 1/5.
## Contents
- `Opc.Ua.Positioning`, `.Server` and `.Client`.
- `Opc.Ua.ISA95.Server` moves onto `IGeoLocationProvider`; the three
ISA-95-specific provider files are removed because the shared seam and
its in-memory implementation replace them.
- **Fixes a conformance gap**: the ISA-95 binder wrote a scalar where
the type declares `ValueRank` OneOrMoreDimensions. It now writes
`String[]`.
- **Fixes a liveness bug**: a provider that cannot push is polled at the
Variable's `MinimumSamplingInterval` rather than installed once, so a
non-pushing provider no longer serves its start-up sample with `Good`
status forever.
- `samples/MinimalIsa95Server`.
## Validation
`dotnet build UA.slnx` — 0 errors.
| Suite | Result |
| --- | --- |
| Opc.Ua.Positioning.Tests | 69 / 0 |
| Opc.Ua.ISA95.Tests | 136 / 0 |
| Opc.Ua.Di.Tests | 304 / 0 |
---------
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8cbb8cd0-f0cb-4ab0-bea2-6202fbf69485
Marc Schier