WIP mirror: universal Flow runtime (fable) - #177
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…ement FlowWire is the transport-neutral flow execution contract: one serializable Request in, one Response out, the same Flow definitions and FlowEngine underneath whether the serving function runs in a browser Service Worker's message listener, a local Bun process's HTTP route, an edge worker's fetch handler, or a cloud sandbox guest's socket loop. serveHttp adds the shared body-in/body-out projection those HTTP placements would otherwise each hand-roll, mapping refusals onto 400/403/404 while always encoding a Response body. CapabilityEnvelope is the one serializable authority that travels with a request: versioned capability patterns every placement interprets the same way, by intersecting the executing host's ambient CapabilitySet — an envelope can only narrow, and both the missing-interpreter and uninterpretable cases refuse execution instead of running wide. The exit now crosses the wire in its JSON codec form, and client rejections carry the refusal's code and detail so a caller can tell refused apart from ran-and-failed without decoding the reason by hand. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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This draft PR is a mirror of local Smithers worktree progress.
Do not merge this PR on GitHub. The synthesized result will be reviewed, merged in a clean local clone, pushed to main, and this mirror will be closed.