feat: ensure all spans end after 10 min

[sohankshirsagar]

Add 10 minute timeout safeguard to automatically close leaked spans

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Note

Introduce a 10-minute timeout that auto-ends spans and clears the timer on normal span termination.

• Tracing (src/core/tracing/SpanUtils.ts):
  • Add 10-minute auto-end safeguard for spans via WeakMap<Span, Timeout> and SPAN_TIMEOUT_MS.
  • On timeout: log warning, set SpanStatusCode.ERROR, span.end(), and cleanup WeakMap; timer uses unref().
  • On normal endSpan(): clear and remove associated timeout before ending.

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