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TIER-2 READ AGENTS.md, conductor/workflow.md, conductor/edit_workflow.md, conductor/tier2/githooks/forbidden-files.txt, conductor/tracks/tier2_leak_prevention_20260620/spec.md, conductor/code_styleguides/data_oriented_design.md, conductor/code_styleguides/error_handling.md, conductor/code_styleguides/type_aliases.md, conductor/product-guidelines.md, conductor/code_styleguides/python.md, docs/guide_meta_boundary.md before Phase 1 Task 1.10. Phase 1 of default_layout_install_20260629: - tests/artifacts/manualslop_layout_default.ini -> layouts/default.ini (git mv preserves history; same content, new parallel-to-themes home) - src/paths.py: layouts: Path field + SLOP_GLOBAL_LAYOUTS env override + get_layouts_dir() accessor (mirror themes at 60/83/150/210+) - src/layouts.py: new LayoutFile @dataclass(frozen=True, slots=True) + load_layouts_from_dir/file + load_layouts_from_disk consumer (mirror src/theme_models.py + src/theme_2.py; Result drain per error_handling) - tests/conftest.py:709: reads from layouts/default.ini