Copilot instructions

1---
2applyTo: "**/Worker/**/*.cs"
3---
4 
5# Worker Layer Rules
6 
7These rules apply exclusively to the `Worker` project layer (background services, message handlers, batch processing).
8 
9## Consumer Design
10- MassTransit consumers must be `sealed` classes
11- One consumer per message type — no multi-message consumers
12- Implement `IConsumer<TMessage>` explicitly
13 
14## Observability
15- Start an `Activity` for every consumer/handler entry point: `App.ActivitySource.StartActivity("OperationName")`
16- Record exceptions on the activity span: `activity?.RecordException(ex)`
17- Use source-generated logging (`[LoggerMessage]`) — never use string interpolation with `ILogger` directly
18 
19## Error Handling
20- Never swallow exceptions silently (`catch (Exception) { }`)
21- Log the exception and let MassTransit's retry/error pipeline handle redelivery
22- Use Polly retry policies for transient external calls (HTTP, database)
23- Propagate `CancellationToken` through the entire call chain
24 
25## Quartz Jobs
26- Apply `[DisallowConcurrentExecution]` on jobs that must not overlap
27- Apply `[PersistJobDataAfterExecution]` when job state must survive between runs
28- Verify Cron schedule expressions — placeholder `{0}` must be replaced with actual values
29 
30## Dependencies
31- `Worker` → `Abstractions`, `Core` (same dependency rules as other layers)
32- No direct database access — delegate to `Core` services or repository interfaces from `Abstractions`
33