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fix(signals): a memo over an error boundary's output no longer halts on a held rejection (#4640) (#4641)

* fix(signals): a staged error marks only a node that reads a staging (#4640)

The settle walk from a held rejection marked every derivation it reached
with the staged error, including a memo over an error boundary's output
(reached through the output, which it does not mark). The commit then
published the error on that memo, past the boundary that caught it, and
halted. stageMark now marks a node only when one of its deps carries the
staging (D-41: a derivation that reads a staged error throws it); a memo
over the output is a plain reader of it (F-3).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* fix(signals): stageMark marks a reader of an async memo's staging (#4640 review)

Dropping CONFIG_ASYNC from the exclusion mask keeps a plain memo over an
async memo over a staged source marked: its verdict stays pending and
latest() throws until the commit (F-9, D-22, D-23, D-41; #4456). The
dep scan returns on the first staged dep.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

* test(signals): pin a memo over an async memo staying pending through a rejection (#4640 review)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWNSSgtemsSYsaX2hXE

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

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