* fix(integrations): truncate api_call JSON lists with sentinel instead of mid-string cut
* fix(integrations): avoid mutating response dict in-place on truncation
* fix(integrations): truncate dict responses and bound list sentinel overhead
- Dict path now walks keys in insertion order, adding them one at a time
while checking that the accumulated dict + _truncated marker fits within
the 12 000-char limit. Previously the marker was appended without removing
any content, so large dicts were not actually truncated.
- List path now subtracts the sentinel's serialised size (+ element-separator
padding) from the budget before binary-searching, so the final array
including the sentinel stays at or under the limit.
- Add regression tests: large-dict actually-truncated, small-dict pass-through,
and list-with-sentinel respects the size bound.
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Co-authored-by: Alexandre Teixeira <111787685+alteixeira20@users.noreply.github.com>