Phase 13.11.ADF: Test infrastructure — run_tests.sh + CAPABILITY_MATRIX

run_tests.sh, phase_tag.sh, generate_capability_matrix.py.
Added @pytest.mark.invariance to test_invariance_backend.py,
test_invariance_compression.py. feature_taxonomy.py draft.
docs/CAPABILITY_MATRIX.md auto-generated (13 verified, 60 invariance tests).

Review: 10/10 approvals (PHASE_13_11_ADF_v1.1). 1432 passed.

Author: miranov25