fix: harden tool output trimming contracts - #4204
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This pull request fixes recurring edge cases in
ToolOutputTrimmerby handling canonical structured text, image, and file outputs through bounded, replay-stable summaries. It prioritizes useful text previews, omits opaque payloads, reports omitted content types when space permits, and leaves malformed or unknown output shapes unchanged.It also replaces broad recursive schema trimming with traversal of known JSON Schema positions, preserving property names, instance data, dependency information, and unfamiliar extensions. Regression coverage now exercises the canonical SDK producer through trimming and Chat Completions replay.