fix(opencode): fix full session fork#26811
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Summary
POST /session/:sessionID/forkwith no request body.{}while preserving the existingmessageIDJSON body path for timeline forks.Why
The full-session fork option calls
session.fork({ sessionID }). Published SDK versions, including the version that introduced full-session fork support and the latest release, send that request with no body and noContent-Type. The legacy Hono route tolerated that shape, but the Effect HttpApi route attempts to decode JSON before the handler runs whenever a payload is declared, so the empty-body request was rejected beforeSession.forkexecuted.The fix keeps the public fork payload contract unchanged (
messageIDremains optional) and restores compatibility at the HTTP boundary instead of changing generated SDK behavior.Verification
bun test test/server/httpapi-session.test.ts