Require a caller-owned artifact resource scope for source traversal and Git metadata reads. Preserve cancellation, filesystem reasons, partial entries and bytes, and cleanup observations through import and the CLI. Transfer exact failed file owners at regular-file admission and close boundaries, including multiple failures encountered by Git reference resolution.
Validation: 169 focused tests passed across 26 files; two Windows-only cases skipped. Build, typecheck, lint, formatting, knip, architecture guards, discovery and docs checks passed.
BREAKING CHANGE: Reference source readers and imports require an ArtifactResourceScope. VCS metadata reads return Result, and CLI import failures include observed details and partial evidence.
Record the exact matching pattern and distinguish project, default, caller, and configured-sensitive exclusions without changing ignore ordering. Include that provenance in graph commitments and validate the contract through compiled CLI and MCP consumers.
BREAKING CHANGE: Pattern-based reference graph exclusions require pattern and distinguish project-ignored and default-ignored reasons. Re-import saved graphs that omit matching patterns.
Share root filesystem failure classification between import preflight and traversal. Missing roots remain invalid selections; permission and I/O errors retain their reason and reach the CLI as execution failures. Preserve cancellation priority and expose unexpected exceptions.
Validation: compiled CLI permission regression, direct reader error details, import/traversal and unreadable-directory boundaries passed. Windows-only cases were skipped on macOS; static, architecture and documentation checks passed.
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