fix: adapt _safe_repair_json to json-repair 0.60 semantics

[theCyberTech]

Summary

Stacked on #6612 (json-repair 0.60.1 bump).

json-repair 0.60.x changed how it handles non-JSON input:

• plain text now repairs to '' (previously '""'/'{}' sentinels)
• brace-enclosed junk like {temperature in SF} now repairs to a single-element list ["temperature in SF}"]

Both cases broke _safe_repair_json's unrepairable-detection in lib/crewai/src/crewai/agents/parser.py, mangling plain-text tool inputs. This treats empty results and list results (for non-array input) as unrepairable, preserving the original input.

Tests

• test_crew_agent_parser.py (15 previously failing) and test_tool_usage.py now pass.
• Remaining local failures are environmental only (missing optional extras: litellm, anthropic, google-genai, a2a) and unrelated to this change.

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