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Add 11 new export/import tests (24 → 35): 4 MUC database, 3 timestamp verification, 3 migration stress, 1 LMC correction with negative assert. Add delay-stamp timestamp checks to 5 base tests via /time chat set iso8601 and /history on (previously passed by accident from PTY buffer). Replace magic numbers: NEGATIVE_ASSERT_TIMEOUT, MIN_ELAPSED_INIT. Add per-test slow/fast thresholds and TZ override (prof_test_tz). Rebalance groups by whole logical blocks (spread 46s → 3s): G1=52s G2=50s G3=53s G4=53s. All 129 tests pass.