[fix] Patch the SSE parser so it handles the delegated RunOutput event shape correctly

[abhi10691]

Summary

Patched the SSE parser so it handles the delegated RunOutput event shape correctly (events vs event).

Fixed the streaming parser bug for delegated remote-member runs.

Updated AgentOSClient._parse_sse_events in libs/agno/agno/client/os.py to support both SSE payload shapes:

• single event payloads with event
• run-output payloads with events (list of event dicts)

The parser now normalizes payloads and parses each event item, so delegated calls that stream RunOutput no longer trigger ValueError("Unknown event type: ...") just because the top-level object has events instead of event.

Added a regression test in libs/agno/tests/unit/os/test_client.py:

• test_stream_handles_run_output_payload_with_events_list
• Verifies that a streamed data: frame containing {"run_id": "...", "events": [...]} correctly yields typed RunStartedEvent and RunCompletedEvent.

(If applicable, issue number: #7517)

Type of change

• [*] Bug fix
• New feature
• Breaking change
• Improvement
• Model update
• Other:

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Checklist

• Code complies with style guidelines
• Ran format/validation scripts (./scripts/format.sh and ./scripts/validate.sh)
• Self-review completed
• Documentation updated (comments, docstrings)
• Examples and guides: Relevant cookbook examples have been included or updated (if applicable)
• Tested in clean environment
• Tests added/updated (if applicable)

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