Failing test first (red: a probe with a raising actual-expr VANISHED — delta 0, total unchanged —
because the loader skips a raising top-level form and args are eager). Fix: host-bl-test is now a
MACRO expanding to (host-bl--check name (fn () actual) expected); the check evaluates the thunk under
(guard (e (true {:__raised …})) …), so an SX raise is recorded as a failure with the error instead
of disappearing. Native exceptions still escape guard — those already fail loud via conformance's
error grep, so this closes the actual silent-skip gap. Keeps the next TDD loop honest.
R2 DEFERRED: investigating it surfaced that lib/host serializes ALL handler evaluation per peer under
one mutex (held across persist IO + the outbound http-request) — zero intra-peer concurrency, so the
outbox 'race' is masked. Logged in plans + memory as the real concurrency task: narrow the handler
mutex for throughput (the multi-co-op future forces it, and that's when masked races become real).
blog suite 260/260; full conformance 662/662.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
giles
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