feature: Stage 4 merge tools use /tmp view of Portage marker (issue #68) - #71
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Reuse launch_tool_with_merge_view_temps so interactive 2-way tools receive a disposable $TMPDIR copy of $path_new, not the real ._cfg* marker. Live and *.merge paths stay real. Extend tool_intro, docs, and Tier D path/hostile coverage.
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Summary
Implements #68: Stage 4 interactive 2-way merges pass tools a disposable
$TMPDIRcopy of the Portage marker ($path_new), reusing the Stage 3 helpers from #65 / PR #67.update_stage4callslaunch_tool_with_merge_view_temps(marker view; ancestor is a no-op when missing)*.mergeremain real; replace/keep/merge/cancel still use real paths after tool exittool_intronotes the new-file pane is a temporary view for 2-way-relevant toolsdocs/ARCHITECTURE.mdStage 4 documentedAcceptance criteria
/tmp(or$TMPDIR) copy of$path_newtool_intronotes temporary new pane when applicableTest plan
perl -c cfg-update./test/run-tests.sh --full(252 passed, 0 failed)