Refactor enricher system in TraceContext

[feelform]

TraceContext currently has multiple enricher patterns that lack consistency:

• traceCompletionEnrichers — filtered by onComplete method
• spanRecorderEnricher — found by record method
• spanEventEnricher — found by recordException method
• sqlMetadataService — passed separately (not via enricher system)

Each enricher is discovered by duck-typing specific method names and threaded through different paths (Trace, CallStack, SpanEventRecorder). This makes it hard to add new enrichers and increases constructor parameter count.

Consider unifying into a single enricher registry or context object that is passed through the trace lifecycle.