Tower visibility in memory status + Phase 5 e2e suite
Extends `cerebra memory status` to show truth tower contents, and ships the Phase 5 end-to-end integration test suite covering all 6 behavioral classes.
v0.2.72026-06-11
·`cerebra memory status` text output now shows Truth Tower section after WM slots: T1 items with nested T2 children, stale orphaned T2s under `[stale, T1 evicted]:` bucket
·`cerebra memory status --format json` always includes `truth_tower` field (zero-count shape when empty, for consistent downstream parsing)
·Phase 5 e2e suite: 14 integration scenarios across TestFullWorkingMemoryFlow, TestFullTowerFlow, TestSessionLifecycle, TestContextSessionInteraction, TestLatticeAwareT1Promotion, TestLockfileEnforcement — all skip cleanly without dev vault / numpy
·Lockfile test confirms: `cerebra search` succeeds with vault lock held (read-only, no lock needed); `cerebra context` and `cerebra memory promote` exit 2 under lock