ca781543ea
All 6 sub-tracks (2A-2F) complete. Audit script: 0 violations (was 67 baseline / 61 before sub-track 2). Track is now FULLY COMPLETE (was previously [~] due to sub-track 2 partial). 79 tests added/passing across sub-tracks 2A-2F. Updated sub_tracks table in state.toml with per-sub-track completion details. Pre-existing test failures (4 unrelated) documented in test_failure_notes.