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2093a8898b
The loop is now transmission-stateless; a request is a pure function of (session log, this step's rendered assembly, current AgentOptions): - The reconstruction boundary is step/start: the messages snapshot is taken in the same synchronous frame immediately before the step/start append, so the request's messages are exactly the derivation over events[0..stepStartSeq) — an inject() from an agent/request listener (or any concurrent task) lands after the boundary and joins the NEXT request. This changes behavior for a synchronous step/start session/event listener that appends content (master derived after the append, so such a listener could reach the current request): agent/pre-step is the sanctioned seam for current-request content. - agent/request is re-typed to config-only: (agent, turn, step, config: LlmCallConfig, next) → LlmCallConfig. The frozen seed comes from AgentOptions on a loop instance's first request (explicit options beat the logged baseline — fork overrides and resume reconfiguration stay correct) and from the log's folded header afterwards; listeners return a replacement to switch. Content shaping through the request is no longer expressible — model-visible content flows through the log channels. - recordRequestHeader appends whatever header event the request owes the log before dispatch: an 'initial'/'resume' snapshot anchoring each loop instance, a round-trip-verified delta on change, a 'fallback' snapshot when the encoding cannot express it. Session.requestHeader() is the log's incrementally-folded baseline. - Requests are deep-frozen before dispatch (deepFreeze exempts the AbortSignal — freezing one breaks AbortController.abort() outright); frozen + sessionId is the loop-built marker the dev invariant keys on. Ported from #162 and re-anchored on the log: the append-extension / frozen-end-to-end / compaction-resend / prompt-change property tests, plus new specs for the boundary semantics, resume anchoring, and the end-to-end theorem (every recorded request rebuilds byte-equal from the log alone). Live cache-hit e2e (request-cache.e2e.ts) verified against the real DeepSeek API. Snapshot goldens intentionally stale until the single re-record after the compact/summary envelope lands.