Merge branch 'claude-docs' into 'main'

docs: add CLAUDE.md for Claude Code integration

See merge request unboundsoftware/shiny/otelsetup!79

.gitignore

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 .idea
+.claude
 /release

CLAUDE.md

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+# otelsetup
+
+Shared Go library for OpenTelemetry setup across all microservices.
+
+## Shared Documentation
+
+@../docs/claude/architecture.md
+@../docs/claude/go-services.md
+@../docs/claude/conventions.md
+
+## Library Information
+
+### Purpose
+
+Provides standardized OpenTelemetry configuration for tracing, metrics, and logging. Used by all Go microservices to enable observability.
+
+### Usage
+
+```go
+import "gitlab.com/unboundsoftware/shiny/otelsetup"
+
+// Bootstrap OpenTelemetry SDK
+shutdown, err := otelsetup.SetupOTelSDK(ctx, enabled, serviceName, buildVersion, environment)
+if err != nil {
+    log.Fatal(err)
+}
+defer shutdown(ctx)
+
+// Wrap HTTP handlers with tracing
+http.Handle("/", otelsetup.Handler(myHandler))
+```
+
+### Features
+
+- **Tracing** - OTLP HTTP exporter with batch processing
+- **Metrics** - OTLP HTTP exporter with periodic reader
+- **Logging** - Stdout log exporter
+- **Propagation** - TraceContext and Baggage propagation
+- **HTTP Handler** - Middleware for automatic span creation
+
+### Environment Variables
+
+- `OTEL_RESOURCE_ATTRIBUTES` - Auto-set if not provided (service.name, service.version, service.environment)
+- Standard OTLP environment variables for endpoint configuration