Tests fixes, audit progress, UI completions

src/Attestor/StellaOps.Attestation/AGENTS.md

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+# Attestation Library Charter
+
+## Working Directory
+- `src/Attestor/StellaOps.Attestation`
+
+## Scope
+- DSSE helpers and in-toto statement models for attestation payloads.
+
+## 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
+- Update sprint tracker and local `TASKS.md`.
+- Keep DSSE signing deterministic and spec-compliant.
+
+## Testing Rules
+- Cover PAE generation, payload type defaults, and base64 conversions.

src/Attestor/StellaOps.Attestation/TASKS.md

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+# Attestation Library 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-0043-M | DONE | Maintainability audit for StellaOps.Attestation. |
+| AUDIT-0043-T | DONE | Test coverage audit for StellaOps.Attestation. |
+| AUDIT-0043-A | TODO | Pending approval for changes. |