feat: trace stitching via LANGFUSE_TRACE_ID#1
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When LANGFUSE_TRACE_ID is set to a valid 32-char hex trace ID, all OTEL spans created by the Vercel AI SDK will reuse that trace ID instead of generating a new one. This stitches OpenCode's tool and LLM spans under the caller's Langfuse trace. Uses a custom IdGenerator that extends RandomIdGenerator, overriding only generateTraceId() — span IDs remain random as usual. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Adds ParentAwareIdGenerator that reuses LANGFUSE_TRACE_ID as the OTEL trace ID, stitching OpenCode spans under the caller's Langfuse trace.