F10: the content-exact reconnect dedup rebuilt boundaryLines only from lines
surviving the current batch, so after one reconnect at a shared timestamp it
forgot the dropped line — a SECOND reconnect at the same nanosecond then
re-emitted both as duplicates. Seed lastTimestamp/boundaryLines from
skipUntilTimestamp/skipBoundaryContents so the boundary set accumulates all
lines ever seen at the resume ts. Regression test (fails before, passes after).
F11: extract rfc3339ToUnixNanoSince into a testable logHelper module (sinceTimestamp.ts)
and cover it (standard ns, no fraction, sub-9 pad, >9 truncate); the controller
imports the single shared function.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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