#File structure

Place behavior in the smallest module that owns its callers and contract.

#Module boundaries

#Why

Importing a domain module should not initialize a client or execute a command.

#Rules

• MUST separate pure domain transformations, resource adapters, and application entrypoints. [review]

• MUST avoid import-time I/O and mutable application globals. [review]

• MUST use explicit imports and avoid wildcard re-export chains. [review]

• MUST keep __init__.py focused on a deliberate public surface. [review]

• MUST keep executable entrypoints thin and coordinate effects there. [review]

• MUST place tests beside their capability or in a corresponding test directory. [review]

• MUST use the consumer's established package and environment layout. [review]

[review]

Import tests expose initialization effects. Lint and typechecks cover configured imports; review establishes module ownership.

#Enforcement

Import tests expose initialization effects. Lint and typechecks cover configured imports; review establishes module ownership.