refactor: decompose 6 monolithic modules (>1000 LOC) into domain packages
Decompose 6 large modules into packages with <400-line modules to satisfy INV_7: - superset_client.py (2145->0) -> superset_client/ package (12 modules) - assistant.py (2683->0) -> assistant/ package (12 modules) - git_service.py (2101->11 shim) -> services/git/ package (9 modules) - git.py (1757->0) -> routes/git/ package (11 modules) - dashboards.py (1619->0) -> routes/dashboards/ package (8 modules) - translate.py (1587->0) -> routes/translate/ package (11 modules) - superset_context_extractor.py (1397->0) -> utils/superset_context_extractor/ (7 modules) All modules <400 lines (INV_7). All 80 tests pass. All external imports preserved via __init__.py re-exports or shim. Semantic [DEF] contracts with @LAYER/@SEMANTICS added to all Module types.
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