Identify the Cutter host through Qt applicationVersion rather than the embedded Rizin module-version report. Preserve unknown host metadata without backend fallback and reuse the existing per-plugin lifetime observation.
Validated 13 Python protocol tests, 66 related CLI/MCP/provider tests, full static/docs gates, and official Linux Cutter 2.5.0 Qt5 public workflows. Native discovery and both Evidence version fields match the independently observed host version; source paths and cleanup remain preserved. The named-tool workflow serialization proxy drops from 8767 to 6912 o200k tokens; this is not model billing.
Fixes#4498.