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fix(signals): skip UNSTABLE_MEMO_OUTPUT for merge()'s function-source memo (#4256) (#4260)

A component spread whose expression is not a plain object compiles to
merge(fn), and merge() wraps the function in a memo with no options. The
idiom returns a fresh key bag every run, so the attribution engine reported
UNSTABLE_MEMO_OUTPUT for memo "computed" with advice (`equals`) nobody can
apply. Observe builds now create that memo as `merge` with a new
CONFIG_KEY_BAG bit, and the unstable-output check skips it. Production
creates the memo exactly as before.


Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

Co-authored-by: Claude <noreply@anthropic.com>

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