# StellaOps.Scanner.Sbomer.BuildXPlugin — Agent Charter

## Mission
Implement the build-time SBOM generator described in `docs/modules/scanner/ARCHITECTURE.md` and new buildx dossier requirements:
- Provide a deterministic BuildKit/Buildx generator that produces layer SBOM fragments and uploads them to local CAS.
- Emit OCI annotations (+provenance) compatible with Scanner.Emit and Attestor hand-offs.
- Respect restart-time plug-in policy (`plugins/scanner/buildx/` manifests) and keep CI overhead ≤300 ms per layer.

## Expectations
- Read architecture + upcoming Buildx addendum before coding.
- Ensure graceful fallback to post-build scan when generator unavailable.
- Provide integration tests with mock BuildKit, and update `TASKS.md` as states change.

## Required Reading
- `docs/modules/scanner/architecture.md`
- `docs/modules/platform/architecture-overview.md`

## Working Agreement
- 1. Update task status to `DOING`/`DONE` in both correspoding sprint file `/docs/implplan/SPRINT_*.md` and the local `TASKS.md` when you start or finish work.
- 2. Review this charter and the Required Reading documents before coding; confirm prerequisites are met.
- 3. Keep changes deterministic (stable ordering, timestamps, hashes) and align with offline/air-gap expectations.
- 4. Coordinate doc updates, tests, and cross-guild communication whenever contracts or workflows change.
- 5. Revert to `TODO` if you pause the task without shipping changes; leave notes in commit/PR descriptions for context.