Tests fixes, audit progress, UI completions

src/Attestor/StellaOps.Attestation/AGENTS.md

@@ -0,0 +1,21 @@
+# 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.