feat(agentic): fresh-interpreter + preinstalled-packages guidance for code agents#17
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…ckage guidance The stateless code-analyst path renders `render_code_exec_supplement`, which never told the model that each `run_code` call is a fresh E2B interpreter or which packages are available. Traces showed the model losing variables between calls (NameError on `df`) and importing unavailable packages (`arch`). Extend the shared workstyle supplement with two principled additions: - Fresh interpreter per execution: no state survives between `run_code` calls, so every script must be fully self-contained (reinforces batching guidance). - Available packages: render `domain.code_exec_preinstalled` with an explicit "other packages are NOT installed" fence. Enrich the preinstalled list to reflect the real E2B template (`aieng-forecasting[agentic,numerical,llm]` on e2bdev/code-interpreter): add scipy (base image), statsforecast/darts/lightgbm (numerical extra) so the list steers the model toward genuinely-available tools. Applied to the default field value and SP500/TSX domains; oil left untouched (it does not call the supplement). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Instruction-level half of the sandbox findings (persistence itself is Phase-2): the code-exec workstyle supplement now states every run_code call is a brand-new interpreter (scripts must be self-contained) and renders the verified preinstalled-package list (enriched to include darts/lightgbm/statsforecast/scipy — all confirmed present in the E2B template; 'arch' correctly absent). Oil/bootcamp paths untouched. 684 passed; pre-commit clean.
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