WEBVTT

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This is an orientation tour of real SlOS recordings. The views are simultaneous, but this tour cuts between labeled excerpts at
normal speed. The other three videos preserve each complete, uninterrupted session.

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The large left pane is Chrome displaying a page served by the Hew coordinator inside SlOS. Here you submit jobs, pause admission,
watch accepted tiles, select their evidence, and download the actual bitmap.

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Top right is the coordinator's real serial console. Assignment and commit messages come from its native guest. This is not a host
scheduler pretending to be the operating system.

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Middle right is the AArch64 worker's serial console. The other two workers are separate x86-64 guests; their full logs are retained.
The render calculation runs inside each Hew user program.

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Bottom right is the host operator's transcript. It labels real user actions, power cuts and verification results. It is not SlOS's
causal graph. The visible delay here is an actual outstanding lease.

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Select a green tile. Its assignment ID is the actual work message identity, whose parent is the worker's pull. Done names that
assignment as its exact parent. The inspector connects an accepted result to a specific worker and attempt, not merely a nearby
timestamp.

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After coordinator power loss, these checked tiles recover on the same volume with unchanged assignment and completion identities.
Upload is only staging. The Hew coordinator publishes a checked immutable tile before reporting application processed. A mailbox
receipt alone is not durable completion.

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The useful distinction is explainable retry and acceptance: which attempt ran, which expired, and which result survived. SlOS
supplies shared global identities and preserved causal parents through its SDK. The application still owns leases, result
validation, persistence and reconciliation.

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Hew supplies the user space policy: the coordinator actor, worker computation and the receiving actors. It compiles on the host into
native user ELFs. These link a freestanding runtime subset, not the normal full Hew runtime. No compiler runs inside the guest.

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Why an entire OS? This renderer does not require one. A mature operating system and tracing libraries could implement the same
contract. SlOS is a controlled experiment in making causal context and explicit resource outcomes common facilities below
applications, rather than conventions reinvented by each service.

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The demonstration proves a working integration, not automatic root cause analysis or exactly once execution. Causal IDs do not make
a dishonest worker correct. These are four QEMU guests on a trusted LAN, not physical hardware or a CPU scaling benchmark.