architecture.md says Arcp.Hosting registers an IHostedService

[nficano]

Category: docs Severity: minor
Location: docs/architecture.md:12-12

What

AddArcpRuntime registers ArcpServer as a singleton plus an options binding (src/Arcp.Hosting/ArcpHostingExtensions.cs:13-23); it registers no IHostedService. Arcp.Hosting.md:5 itself states it does not provide an IHostedService.

Evidence

| `Arcp.Hosting`    | Registers a runtime in `IHostedService` for non-ASP.NET workers. |

Proposed fix

Reword to 'Registers ArcpServer as a DI singleton (no IHostedService) for non-ASP.NET workers.'

Acceptance criteria

• The description matches what AddArcpRuntime registers.

[nficano]

Fixed in #77 (merged).