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* fix(memory): truncate mem0 context injection on entry boundaries Mem0Manager.get_context built the injection block and then hard-cut it at max_injection_chars, which could sever the last memory mid-line and leave a dangling partial entry in the agent prompt. Accumulate whole entries against the remaining budget instead: a memory that does not fit is skipped (a shorter later one may still fit). When not even the first memory fits, fall back to the previous hard-truncation behavior for that single entry rather than injecting nothing. Tests: entry-boundary truncation, skip-oversized-keep-later, and the oversized-first-entry fallback. * fix(memory): keep entry-boundary guarantee when no mem0 memory fits Follow-up to PR #4600 review: remove the hard-truncation fallback that could inject a partial memory when max_injection_chars is smaller than every recalled entry. Instead return empty context and log a warning that surfaced the undersized budget.