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4bf47c9b80
#7847 reports a 3.05 MiB request (729 messages / 86 tools) reaching ~12,282 MiB of V8 heap, and asks for "a regression benchmark that records peak heap for representative 500-800-message, tool-rich requests" before any fix lands. There is currently no memory baseline in the repo at all (bench:compression is the only benchmark), so a clone-reduction change could neither be justified nor regression-guarded. npm run bench:heap-body attributes retained heap to each copy the chat path makes: | mechanism | call site | retained | x wire | | cloneLogPayload (unbounded) | chat.ts buildClientRawRequest | 3.18 MiB | 1.04x | | cloneBoundedForLog (bounded) | requestLogger.logClientRawRequest | 0.04 MiB | 0.01x | | structuredClone x3 (combo targets) | combo.ts attemptBody | 9.53 MiB | 3.12x | | JSON.stringify (token estimate) | combo.ts estimateTokens | 3.06 MiB | 1.00x | | per request (sum) | |15.81 MiB | 5.17x | It measures the real production helpers rather than reimplementations, so a change to the log bounds or the clone strategy is reflected directly. Design notes: - Deterministic: fixed-seed LCG, no Math.random(). Verified byte-identical across three consecutive runs — without that, a before/after delta measures noise, not the change. - Corpus lives in its own side-effect-free module so the unit test can import it without booting SQLite (requestLogger transitively opens the DB at import time). - Hermetic: DATA_DIR is redirected to a temp dir before importing, so the benchmark never touches the operator's real ~/.omniroute store. - Node, not bun: --expose-gc and V8 heap accounting are the measurement; another engine's heap number would not describe the production runtime. - --max-retained-mib exits non-zero, so this can become a CI gate once a target is agreed. Reports only; wires nothing into CI and changes no production code.