Tests fixes, audit progress, UI completions

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

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+# StellaOps.Attestor.StandardPredicates Local Agent Charter
+
+## Scope
+- This charter applies to `src/Attestor/__Libraries/StellaOps.Attestor.StandardPredicates/**`.
+
+## Primary roles
+- Backend engineer (C# / .NET 10).
+- QA automation engineer (xUnit).
+
+## Required reading (treat as read before edits)
+- `docs/modules/attestor/architecture.md`
+- `docs/product-advisories/14-Dec-2025 - Proof and Evidence Chain Technical Reference.md`
+- RFC 8785 (JSON Canonicalization Scheme)
+- SPDX 3.0.1, CycloneDX 1.6/1.7, and SLSA provenance v1.0 references
+
+## Working agreements
+- Determinism is mandatory: canonical JSON, stable ordering, UTC timestamps only.
+- Avoid network access; keep parsing offline-friendly.
+- Prefer explicit validation with structured errors and stable metadata output.
+- Keep predicate parsing logic pure and side-effect free; log only for diagnostics.
+
+## Testing expectations
+- Every behavior change must be covered by tests under `src/Attestor/__Tests/StellaOps.Attestor.StandardPredicates.Tests`.
+- Include numeric canonicalization edge cases, schema validation behavior, and SBOM hash determinism checks.

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

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+# Attestor StandardPredicates 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-0064-M | DONE | Maintainability audit for StellaOps.Attestor.StandardPredicates. |
+| AUDIT-0064-T | DONE | Test coverage audit for StellaOps.Attestor.StandardPredicates. |
+| AUDIT-0064-A | TODO | Pending approval for changes. |