Miguel de Benito Delgado 745360c46f ♻️ Consolidate scene building macros and helpers
- Shared macro expansion for shapes and containers.
- Shared runtime construction for rectangles, paths, and circles.
- Centralized container attribute validation.
- Simplified imports in the seven callers.
- Added behaviour tests for seeded IDs, defaults, expression
  evaluation order, and container failures.

AI-assisted-by: gpt-6.1-sol
2026-11-05 11:18:15 +01:00
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