Tests fixes, audit progress, UI completions

src/Attestor/__Tests/StellaOps.Attestor.Oci.Tests/AGENTS.md

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+# Attestor OCI Tests AGENTS
+
+## Purpose & Scope
+- Working directory: `src/Attestor/__Tests/StellaOps.Attestor.Oci.Tests/`.
+- Roles: QA automation, backend engineer.
+- Focus: unit and integration tests for OCI attestation attach/list/fetch/remove and reference parsing.
+
+## Required Reading (treat as read before DOING)
+- `docs/README.md`
+- `docs/07_HIGH_LEVEL_ARCHITECTURE.md`
+- `docs/modules/attestor/architecture.md`
+- `docs/modules/platform/architecture-overview.md`
+- Relevant sprint files.
+
+## Working Agreements
+- Keep tests deterministic (fixed time/IDs) and avoid network by default.
+- Integration tests must be explicitly skipped or opt-in and document required containers.
+- Ensure tests reflect current production behavior; update when APIs change.
+- Update `docs/implplan/SPRINT_*.md` and the local `TASKS.md` when starting or completing work.
+
+## Testing
+- Use xUnit + FluentAssertions + Moq; keep fixtures reusable and deterministic.
+- Cover negative paths, serialization, and digest/annotation behavior.

src/Attestor/__Tests/StellaOps.Attestor.Oci.Tests/TASKS.md

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+# Attestor OCI Tests Task Board
+
+This board mirrors active sprint tasks for this module.
+Source of truth: `docs/implplan/SPRINT_20251229_049_BE_csproj_audit_maint_tests.md`.
+
+| Task ID | Status | Notes |
+| --- | --- | --- |
+| AUDIT-0057-M | DONE | Maintainability audit for StellaOps.Attestor.Oci.Tests. |
+| AUDIT-0057-T | DONE | Test coverage audit for StellaOps.Attestor.Oci.Tests. |
+| AUDIT-0057-A | TODO | Pending approval for changes. |