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fix(signals): stage a pass's error before the flush joins its hold (#4109) (#4156)

* fix(signals): stage a pass's error before the flush joins its hold (#4109)

A synchronous memo whose pass threw in a flush published the error at once
unless the flush had already joined a hold. When the pass ran before its
async sibling went pending, the error showed ahead of the frame (D-41): an
untracked read threw while the screen still showed the committed value.
Stage it whenever the pass read a staging inside a flush; the seam holds
it with the frame, or the commit publishes it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

* perf(signals): gate the pass-staged error on a running flush alone (#4109)

flushTransaction implies nothing extra here once the pass is inside a
flush: the one check covers the #4109 case and keeps the core floor at
+2 B minified over next (was +7 B).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

* fix(signals): a later pass replaces a staged error (#4109)

CONFIG_STAGED_ERROR was cleared only at the commit. With a pass's own
throw now staged whenever a flush runs, a memo that throws and re-runs
in the same flush kept the flag: a value re-run was thrown as an error
(its raw value reached the error arm, #4145), and a pending re-run left
the superseded error to be published at the commit.

A pass now drops an error staged by an earlier pass before it runs:
its own answer (a value, a flight, or an error it stages again)
replaces it. This folds in #4148's clear on the value path.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

* chore(size): raise caps for the #4109 staged-error clear (Size-Exception)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@an... (continued)

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