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* fix(middlewares): end length-capped turns cleanly, prevent todo re-engagement, annotate write_file budget When a model hits its per-response output cap (finish_reason=length) while emitting a write_file tool call, ModelLengthFinishReasonMiddleware suppresses the truncated call and stamps model_length_termination. TodoMiddleware must not re-engage (jump_to=model) on such a capped turn -- doing so re-emits the same oversized call into the same cap, producing up to 3 futile responses with junk fragments instead of a clean truncation notice. Changes: - TodoMiddleware.after_model: skip completion reminder jump when additional_kwargs.model_length_termination is present (follows the existing deerflow_error_fallback precedent). - ModelLengthFinishReasonMiddleware: always append the length notice when tool calls were suppressed, even when partial text survived (collapses the visible-content ternary). Fixes a latent bug in append_visible_text that silently dropped string content. - tools.get_available_tools: annotate write_file's model-visible description with the model's configured max_tokens output budget. Guarded extraction safely handles missing or non-numeric tokens, and the tool is cloned via model_copy to keep module-level singletons immutable across assemblies and prevent guidance leakage to unbudgeted models. - release_policy_parameters() updated for both middlewares. - AGENTS.md chain entries (#20, #35) and module docstrings updated within AG002 guidance limits. - Tests: 8 new/focused unit tests + 1 updated pin + 1 real create_agent() integration test reproducing the incident (thread b1723286). * fix(tools): use effective model cap for write_file guidance --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>