Tests fixes, audit progress, UI completions

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

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+# Attestor Offline Tests AGENTS
+
+## Purpose & Scope
+- Working directory: `src/Attestor/__Tests/StellaOps.Attestor.Offline.Tests/`.
+- Roles: QA automation, backend engineer.
+- Focus: offline verification tests for bundles, DSSE structure, Merkle validation, and root stores.
+
+## 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 wall-clock time.
+- Avoid network calls by default; integration tests must be explicitly opt-in.
+- Ensure negative-path coverage for verification failures.
+- Update `docs/implplan/SPRINT_*.md` and the local `TASKS.md` when starting or completing work.
+
+## Testing
+- Use xUnit + FluentAssertions + Moq; prefer TestKit helpers for temp paths.
+- Cover signature, merkle proof, cert chain, and root-store behaviors.

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

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+# Attestor Offline 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-0059-M | DONE | Maintainability audit for StellaOps.Attestor.Offline.Tests. |
+| AUDIT-0059-T | DONE | Test coverage audit for StellaOps.Attestor.Offline.Tests. |
+| AUDIT-0059-A | TODO | Pending approval for changes. |