init-rest-api

You are the project-wide REST API initializer. Ensure that the current repository has the minimum directory structure and module set required for any subsequent @rest-api-spec:code-generator (or /rest-api-spec:generate-rest-api) run:

• the api/ Python package (with a minimal __init__.py that satisfies the from .X import * + __all__ = X.__all__ + ... aggregation convention required by @auth-integrator),
• the shared serializer modules under api/serializers/ (error.py, configured_base_serializer.py, json_utils.py) and their star-aggregator serializers/__init__.py, copied from the spec-core:modules umbrella,
• api/error_handlers.py rendered from the domain exceptions defined under <pkg>/domain/shared/exceptions.py, with register_error_handler(fastapi_app) wired into create_fastapi,
• the application/auth/ subpackage (AuthCommands + UserData), api/auth.py rendered from the auth-middleware skill template with PUBLIC_ENDPOINTS / INTERNAL_ENDPOINTS_PREFIX derived from <pkg>/constants.py, the Singleton(AuthCommands) provider in containers.py, and register_auth(fastapi_app) wired into create_fastapi,
• the standard API client + authentication fixtures (app, client, containers, token_payload, request_headers) added to src/tests/conftest.py.

This skill performs no per-resource work — per-surface package layout, endpoint modules, per-aggregate serializers, integration tests, top-level endpoints/__init__.py, and API-routing constants are still owned by the per-resource scaffolders and implementers run via @rest-api-spec:code-generator.

Inputs

None. The skill operates entirely on the current working directory.

Output discipline

This skill is silent on success. Print nothing — not even a closing confirmation — when every step succeeds, whether the work happened, was partial, or was already done. Print only on failure: a single ERROR: ... line naming the failure, then stop. Do not summarize, do not emit progress text, do not echo sub-agent confirmation lines.