fix(context): add return_exceptions to asyncio.gather in reference expansion

[x7peeps]

Summary

Add to in so that a single failed reference expansion does not crash the entire concurrent expansion of all other references.

Problem

calls without when expanding multiple references (file, folder, url, etc.) concurrently. If one reference fails (e.g. a URL fetch times out or a file is unreadable), the exception propagates and aborts all other reference expansions in flight. A message like would lose the expansion too.

Fix

• Added to the call (1 line change)
• Added exception handling in the result loop to capture failures as warnings instead of unpacking them as tuples (4 lines)

Testing

• Syntax check passed (py_compile)
• Behavior verified: individual reference failures no longer cascade

[x7peeps]

Closing as superseded by #59954 (consolidated context reference expansion fix).