docs(code-reviews): re-triage ClusterInfrastructure-001 — bootstrap lives in Host, needs design decision

code-reviews/ClusterInfrastructure/findings.md

@@ -83,7 +83,49 @@ should clearly state it is unimplemented so callers do not assume otherwise.
 
 **Resolution**
 
-_Unresolved._
+_Re-triaged 2026-05-16 — remains Open, needs a design decision from the user._
+
+Verified against the source at the reviewed commit: the finding's factual claims hold.
+`src/ScadaLink.ClusterInfrastructure` still contains only `ClusterOptions.cs` and a
+no-op `ServiceCollectionExtensions.cs`, and the `.csproj` references no Akka packages.
+
+However, the documented cluster behaviour is **not actually absent from the system** —
+it has been implemented in the **Host** project rather than in this module:
+
+- `src/ScadaLink.Host/Actors/AkkaHostedService.cs` bootstraps the `ActorSystem`,
+  generates the HOCON from `ClusterOptions` (it imports `ScadaLink.ClusterInfrastructure`
+  and injects `IOptions<ClusterOptions>`), and configures the `keep-oldest` split-brain
+  resolver with `down-if-alone = on` (see `AkkaHostedService.cs:95-96`).
+- `src/ScadaLink.Host/Health/AkkaClusterHealthCheck.cs`, `AkkaClusterNodeProvider.cs`,
+  and `Health/ActiveNodeHealthCheck.cs` cover cluster membership / active-node detection.
+- Akka cluster/remote package references live in `ScadaLink.Host.csproj` and the
+  per-component projects (`SiteRuntime`, `Communication`, etc.).
+
+So the real situation is an **ownership / design-doc drift**, not missing behaviour:
+`Component-ClusterInfrastructure.md` assigns the Akka bootstrap, HOCON generation,
+split-brain config and `CoordinatedShutdown` wiring to this module, but the
+implementation deliberately lives in the Host. `ClusterOptions` is the one piece this
+module legitimately owns and it is consumed correctly by the Host.
+
+Resolving CI-001 as literally written is **not a small, well-scoped fix** — it is one
+of two substantial decisions, both requiring the user:
+
+1. **Move the bootstrap into this module** — relocate the HOCON generation, split-brain
+   config, cluster-singleton helpers and `CoordinatedShutdown` wiring out of
+   `ScadaLink.Host` into `ScadaLink.ClusterInfrastructure`, add the Akka package
+   references, and re-wire the Host to call into it. This is a cross-module refactor
+   touching `src/ScadaLink.Host/*` and several other projects — outside the edit scope
+   permitted for this finding (only `src/ScadaLink.ClusterInfrastructure/`,
+   `tests/ScadaLink.ClusterInfrastructure.Tests/`, and this file may be edited).
+2. **Accept the current placement** — keep the bootstrap in the Host and update
+   `Component-ClusterInfrastructure.md` (and the README component table) to record that
+   the Host owns the actor-system/cluster bootstrap and that this module's role is the
+   shared `ClusterOptions` contract. That fix is a design-doc edit, also outside this
+   module's permitted edit scope.
+
+Either path is a deliberate architecture decision, not a bug fix, so per
+REVIEW-PROCESS.md §2 this finding is left **Open** and surfaced for the user to decide.
+No code change was made. Module test suite verified green (3 passed) at re-triage time.
 
 ### ClusterInfrastructure-002 — No-op DI extension methods report success while doing nothing