Tests fixes, audit progress, UI completions

src/Attestor/StellaOps.Attestation.Tests/AGENTS.md

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+# Attestation Tests Charter
+
+## Working Directory
+- `src/Attestor/StellaOps.Attestation.Tests`
+
+## Scope
+- Unit tests for attestation DSSE helpers and models.
+
+## Required Reading
+- `docs/modules/attestor/README.md`
+- `docs/modules/attestor/architecture.md`
+- `docs/modules/attestor/implementation_plan.md`
+- `docs/modules/platform/architecture-overview.md`
+- `src/Attestor/AGENTS.md`
+
+## Working Agreements
+- Keep tests deterministic and focused on DSSE invariants.
+- Update sprint tracker and local `TASKS.md`.
+
+## Testing Rules
+- Validate PAE byte structure and payload type defaults.
+- Include error-path coverage for base64 parsing.

src/Attestor/StellaOps.Attestation.Tests/TASKS.md

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+# Attestation 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-0044-M | DONE | Maintainability audit for StellaOps.Attestation.Tests. |
+| AUDIT-0044-T | DONE | Test coverage audit for StellaOps.Attestation.Tests. |
+| AUDIT-0044-A | TODO | Pending approval for changes. |