docs: expand STREAM_EVENTS_IMPLEMENTATION.md for issue #799

[cyber-excel10]

Closes #799

What

Expands STREAM_EVENTS_IMPLEMENTATION.md documentation as requested in issue #799.

Why

The existing documentation was minimal and didn't reflect the full implementation state.

Key Changes

• ✅ Document all 10 current event types with payloads and frontend rendering
• ✅ Add comprehensive "How to add new event type" guide
• ✅ Detail indexer processing (circuit breaker, checkpointing, deduplication)
• ✅ Document frontend timeline component with filtering
• ✅ Mark current vs planned implementation clearly
• ✅ Add API reference, testing strategy, and deployment considerations

Files Modified

• STREAM_EVENTS_IMPLEMENTATION.md - Completely rewritten and expanded

Testing

• Documentation reviewed for completeness and accuracy
• All acceptance criteria from [FEATURE] Add STREAM_EVENTS_IMPLEMENTATION.md expansion #799 explicitly addressed

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