[kvlonge]

Why

The waffle-shop playground still used the legacy models/marts/_macros/ declaration layout while the docs teach _sqlbuild/_macros/, and the Python nodes playground imported SkipMode from an internal module instead of the public sqlbuild.tasks API. Examples built from the playground therefore mixed layouts.

Changes

• Move the marts-only macros to models/marts/_sqlbuild/_macros/ (same exact-owner-private visibility).
• Import SkipMode from sqlbuild.tasks in the Python nodes playground.
• Regenerate the bundled docs skill from sqlbuild-docs, including the corrected quickstart project tree (chio-labs/sqlbuild-docs#54) and already-published janitor, plan, migrations and configuration pages.
• Assert the current layout and public import in the playground tests.

Verification

• Playground unit and E2E tests pass (16); the new assertions fail without the fix.
• Generated playground compiles and builds (95 steps) with unchanged macro visibility via sqb scope.
• make check-ci and the hygiene scan pass.