Implement the 007-add-knip feature that adds Knip unused code detection to the quality gate and as a standalone command

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

specs/007-add-knip/data-model.md

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+# Data Model: Add Knip Unused Code Detection
+
+**Date**: 2026-03-05
+
+## Overview
+
+This feature is a developer tooling integration. It introduces no domain entities, state transitions, or persistent data. The only artifacts are configuration files.
+
+## Configuration Artifacts
+
+### Knip Configuration (`knip.json`)
+
+- **Purpose**: Defines workspace scope and any overrides for Knip's auto-detection.
+- **Location**: Repository root.
+- **Key fields**: `$schema`, `workspaces` (maps workspace glob patterns to per-workspace config).
+
+### Root Package Scripts (modification)
+
+- **Artifact**: `package.json` `scripts` field.
+- **Change**: Add `knip` script; update `check` script to include Knip in the quality gate chain.
+
+## No Domain Impact
+
+This feature does not modify domain types, application use cases, or adapter code. It only adds a static analysis tool to the build/check pipeline.