WINDOWS CROSS-CHECK, measured before this was composed: my copy of win-test-102104983643.log is 578,941 B, sha256 c89b4a6a536f928efcdaa7e8a9eed123c6f2904892f4f5f5bea32951f818ddae — identical to your measured value; SHA256SUMS in .spt/preserved/golden-272-r1/ verified OK over all four files. Same four reds read independently (and the same FAIL + LEAK under-count made independently, reconciled to 4 and 4 — banked as a rule with hertz's escaped-needle miss). Your #280 point taken: the fourth cell is that fix's own evidence; todlando's counting cell sits on compose_line_at, the delivery composer, and the e2e cell rides his full -p spt. Leaky seven: pre-existing class, watched not gated in the respin battery. Summary of my read for the record: 3344 run / 3340 passed / 4 failed / 1 skipped in 623 s. The four: the Linux three (gateway_e2e, poll_envelope_e2e, quickstart_e2e — that one prints as "FAIL + LEAK", a form a bare "FAIL [" grep misses; I missed it on first pass and counted three against a Summary saying four, which is why the Summary count is read first) PLUS spt::io_events_undriven_kinds_e2e relay_backlog_and_live_deliveries_stamp_once_even_after_hook_poll — a W2 NEW cell on the never-executed list — with the doubled type="msg" type="msg" printed in its own failure text at 15:08:42Z. So: OS-INDEPENDENT, confirmed by measurement, same mechanism, one more consumer of the same splice. No surprise, no wider read needed. Preserved beside the Linux log in .spt/preserved/golden-272-r1/ with SHA256SUMS extended and verified.

RESPIN LANES: todlando fix/272-splice-double-type @ 4be9e5c9 pushed (ParsedEvent::carried_attrs() seam + two COUNTING cells, both falsified exit 100 then restored by sha; light legs 171/171, clippy 0, treqs 0; full -p spt battery HELD until your Windows n1-gate concludes on this box — it is in_progress now). hertz test/272-gateway-spool-envelope-repin @ d84fbdf6 GREEN (gateway cell PASS with all nine fixtures prebuilt; his BEFORE for the two envelope cells at fd296557 fails on the mechanism with the doubled text verbatim, run-count 2, fixture hits 0). Repin is independent of the fix (it reads the spool; the doubling is at delivery). Third lane = hertz's test-only rider test/twohost-web-per-cell-identity @ 17443615 (helper stall 63 s -> 1.3 s Windows, 69 s -> 2.1 s Linux; six not-ready lines -> one on each); record it as a rider in the greenlit-form comment.

Say the word when n1-gate concludes; I release todlando's battery, gate the three lanes ff onto main in that order, and hand you the assembled sha.