a8adfa9843v0.1.21 still trapped with ZERO jump-refused beacons: the fatal swap PASSED the C++ swap_suspended guard. Mechanism (async/16 round 2): a fresh JS entry executing while g_current_context still points at a parked fiber gets attributed to that fiber — fiber_swap writes a fresh, valid-LOOKING foreign suspension into the parked fiber's struct and re-marks the flag. The flag lies; the resume rewinds garbage. This guard tracks truth at the emscripten-fiber layer (handlesleep.js wraps Fibers.finishContextSwitch): - valid suspensions = real swap-outs (currData == oldFiber+20 when the trampoline runs), consumed on rewind; - internally-parked = an entered slice that ended in a handleSleep park (currData set, no nextFiber) — quarantined until a GENUINE swap-out, where genuine means the fiber's pending sleep has resolved (__pendingSleepContexts), so a laundering write cannot lift it; - entering a quarantined or suspension-less fiber is REFUSED ([wx-asyncify] fiber-resume-refused, ghost contract). The ROOT context is exempt from quarantine and refusal: its rewound continuation runs the whole main loop, whose routine yield park says nothing about a fiber body — the first build of this guard quarantined main off that signal and starved every coroutine return (19 collab e2e reds, empty results). Root = the old side of the first switch ever. .ci-cache-epoch 2→3: the wasm output cache key omits scripts/**. Red/green: fiber-resume-park.spec.ts scenario 2 (laundered resume → exactly one refusal beacon, both coroutines complete); full fiber-heavy sweep green (21 passed). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019SE4o46Lnq3hF574FFq8x4
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