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511c764f45
When an LLM response arrives with finish_reason='length' and has_tool_calls but blank text content (e.g. the model spent its whole output budget on a tool call whose closing tag was truncated), the runner dropped the tool calls and then misrouted the blank response into the empty-response retry branch. Retrying the same prompt cannot recover from output-budget exhaustion, so every retry hit the same length ceiling and the turn ended in the generic apology. The length-recovery branch was gated on 'finish_reason == length and not is_blank_text(clean)', so a blank-but-truncated turn could never reach it. - The empty-response retry branch now excludes finish_reason == 'length' (in addition to 'error'). - The length-recovery branch no longer requires non-blank content, so a blank-but-truncated turn enters recovery and appends build_length_recovery_message (which handles a blank tail safely). Adds a regression test asserting the length-recovery path is taken; it fails on the unfixed code and passes with the fix. Fixes #5133