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Factory Pattern: Polymorphism with Type and Instance Overrides: Pitfalls

Pitfalls for Factory Pattern: Polymorphism with Type and Instance Overrides.

Pitfalls and red flags

Setting overrides after env/components have already been created in build_phase.
Using `new` directly instead of `type_id::create`, which bypasses factory policy.
Assuming type override beats a matching instance override; instance-specific mapping wins.
Misspelling hierarchy paths in `set_inst_override`, causing silent no-op behavior.

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