b76f39d3a6
Patch axis: extend Displacement: net-zero; reuses existing plan reference state instead of adding persistence or overwriting approved artifacts Rule violations averted: no approved-plan overwrite, no transcript format migration, no public CLI/API expansion PASS/FAIL: PASS after plan-mode focused tests and package check. Note: system-prompt-templates has an unrelated HOME=/tmp path-shortening expectation failure.