abstraction_removal

Scope: Removal of unused abstraction layers.
Audience: Contributors and reviewers.
Guarantees: Removed layers are documented and tested.
Non-Goals: Historical narrative.
Why: This doc exists to record its single responsibility for review.

Overview

This doc records the abstraction removal.
Architecture components are defined in Architecture.
Read Docs Style for structure.

Contracts

The contracts interface layer was removed.
The registry base class was removed.
The registry re-export indirection was removed.

Invariants

Direct imports replace removed layers.
Registry behavior remains explicit.
Public interfaces remain tested.

Failure Modes

Missing imports fail tests.
Unexpected coupling fails review.
Undefined layers are rejected.

Extension Points

Removals update Design Debt.
Public interface changes update Core.
Documentation updates follow Triage.

Exit Criteria

This doc becomes obsolete when removals are generated.
The replacement is Core.
Obsolete docs are removed.

Code refs: src/agentic_proteins/registry/agents.py.