Class CircularDependencyRule

Circular Dependency Rule (solid:circular-dependency) - detects runtime import cycles between project files.

Detection:

• Builds a project-wide value-import graph (see ImportGraph): import type / type-only specifiers are ignored, export * from and export { x } from barrels are followed, and specifiers resolve through tsconfig path aliases, relative paths and index.ts probing.
• Files are read from disk, not from the ts-morph project, so results do not depend on which files a scan batch currently has loaded. In-memory projects are read from the project and its file system.
• Strongly connected components are computed with Tarjan's algorithm; each analyzed file inside a non-trivial component gets one violation with the shortest cycle through it.
• Cycles whose edges carry DI or decorator usage (forwardRef, inject(), constructor parameter types, decorator providers / imports) are flagged ng0919Risk: true with metadata severity high (Angular NG0919: cannot read the provider/class before initialization).

Result metadata: CircularDependencyMetadata. Graphs are cached per tsconfig for CircularDependencyRuleOptions.snapshotTtlMs.