Created src/cleveragents/shared/output_format.py - a new shared module
with format_data() function that provides JSON/YAML/plain/table
serialization without any CLI dependencies.
Fixed reverse dependency in plan_apply_service.py - changed import from
cleveragents.cli.formatting to cleveragents.shared.output_format (the
most critical architectural violation: Application layer importing from
Presentation layer).
Added .importlinter configuration file with rules to enforce:
- No Application->Presentation (CLI) reverse dependencies
- CLI->Application boundary violations (with current exceptions documented)
Added import-linter>=2.0 to dev dependencies in pyproject.toml.
Added BDD feature file features/a2a_boundary_enforcement.feature with
10 scenarios testing the boundary enforcement and step definitions.
ISSUES CLOSED: #9962
