Batch 1 of the ad hoc timeout literal migration (epic #4445). Replaces
every bare numeric timeout/timeoutMs object-literal property in
tests/process-seam.test.cjs, tests/helpers-process-isolation.test.cjs,
tests/run-with-timeout.test.cjs, and tests/helpers.cjs with a named
constant, per eslint-rules/no-adhoc-timeout-literal.cjs. Removes the
4 files from the rule's allowlist.
Adds SEAM_DEFAULT_TIMEOUT_MS to tests/helpers/timeouts.cjs (shared
across 2 batch files, mirroring process-seam.cjs's own un-exported
default). File-local constants elsewhere for values not shared across
files or not a bench-derived class norm. No src/bin file touched, no
numeric value changed anywhere.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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