telemetry.ts: Add span context propagation to telemetry events

[Kingsman-99]

Description

src/telemetry.ts emits events but does not attach a parent span context when events are nested inside an active trace. This means distributed traces lose their parent-child relationship, making root-cause analysis in tracing backends difficult.

Acceptance Criteria

• TelemetryEvent type includes an optional parentSpanId field
• When a span is active, child events automatically inherit the parent span ID
• Events emitted outside any span have parentSpanId: undefined
• Unit tests pass

Context

• Target file: src/telemetry.ts
• Must not break existing event consumers that do not read parentSpanId

[graceanya796-maker]

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[spotkorner-dot]

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@spotkorner-dot's PR #708 was approved and merged by @Kingsman-99.

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