Add pytest integration tests that run EXPLAIN against real Postgres schema to detect phantom column/table references before PR merge. 12 EXPLAIN test cases covering domrf_kn_objects, ekburg_construction_permits, mv_layout_velocity, domrf_kn_flats, objective_* and cad geo tables. Tests skip without TEST_DATABASE_URL; CI integration is a follow-up. Pre-empts phantom column bugs caught manually on PR #196 (geom_3857) and PR #213 (units_count). Closes #197
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Python
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Python