Tests fixes, audit progress, UI completions

src/Attestor/__Libraries/StellaOps.Attestor.GraphRoot/AGENTS.md

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+# Attestor GraphRoot AGENTS
+
+## Purpose & Scope
+- Working directory: `src/Attestor/__Libraries/StellaOps.Attestor.GraphRoot/`.
+- Roles: backend engineer, QA automation.
+- Focus: graph root attestation, Merkle root computation, DSSE envelope creation, Rekor submission.
+
+## 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
+- Preserve deterministic ordering and canonical JSON outputs.
+- Keep DSSE signing and verification spec-aligned (PAE, payloadType).
+- Avoid wall-clock time in core logic; inject time providers where needed.
+- Update `docs/implplan/SPRINT_*.md` and the local `TASKS.md` when starting or completing work.
+
+## Testing
+- Add unit tests under `src/Attestor/__Libraries/__Tests/StellaOps.Attestor.GraphRoot.Tests/`.
+- Ensure tests cover sign/verify, Merkle root determinism, and Rekor submission paths.

src/Attestor/__Libraries/StellaOps.Attestor.GraphRoot/TASKS.md

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+# Attestor GraphRoot 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-0053-M | DONE | Maintainability audit for StellaOps.Attestor.GraphRoot. |
+| AUDIT-0053-T | DONE | Test coverage audit for StellaOps.Attestor.GraphRoot. |
+| AUDIT-0053-A | TODO | Pending approval for changes. |