[Test] MessageLogged event context mutability issue

[mrpastewart]

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Log

Which jobs/test(s) are failing

test/events/message_logged_test.dart:MessageLogged context is immutable

Reason for failure/description

The MessageLogged event's context is not properly enforcing immutability. The test expects the context value to remain "value" but it's being modified to "modified".

Error details:

Expected: 'value'
Actual: 'modified'
Which: is different.
       Expected: value
         Actual: modified
                 ^
        Differ at offset 0

Is this a regression?

No

Media proof

00:01 +2 -30: test/events/message_logged_test.dart: MessageLogged context is immutable [E]
  Expected: 'value'
    Actual: 'modified'

Additional context

• Location: packages/log/test/events/message_logged_test.dart
• The context object in MessageLogged events should be immutable
• Current implementation allows modification of context values after creation
• This is a data integrity issue that could lead to inconsistent logging state